diff --git a/cobalt/browser/BUILD.gn b/cobalt/browser/BUILD.gn
index cc9d76266083..25e387a2aa15 100644
--- a/cobalt/browser/BUILD.gn
+++ b/cobalt/browser/BUILD.gn
@@ -415,3 +415,10 @@ cache_lex_tables("cached_lex_yacc_tables") {
 cache_templates("cached_jinja_templates") {
   output_dir = _bindings_scripts_output_dir
 }
+
+group("test_dependencies_on_browser") {
+  testonly = true
+
+  # TODO: 297087147 - Depend on smaller targets than browser.
+  deps = [ "//cobalt/browser" ]
+}
diff --git a/cobalt/browser/metrics/BUILD.gn b/cobalt/browser/metrics/BUILD.gn
index 3f25f1a9fa85..62c85fa5e558 100644
--- a/cobalt/browser/metrics/BUILD.gn
+++ b/cobalt/browser/metrics/BUILD.gn
@@ -51,6 +51,7 @@ target(gtest_target_type, "metrics_test") {
   deps = [
     ":metrics",
     "//base",
+    "//cobalt//browser:test_dependencies_on_browser",
     "//cobalt/browser:generated_types",
     "//cobalt/h5vcc",
     "//cobalt/h5vcc:metric_event_handler_wrapper",
diff --git a/cobalt/css_parser/BUILD.gn b/cobalt/css_parser/BUILD.gn
index e7be240449fc..8cbc194def3b 100644
--- a/cobalt/css_parser/BUILD.gn
+++ b/cobalt/css_parser/BUILD.gn
@@ -122,6 +122,7 @@ target(gtest_target_type, "css_parser_test") {
     ":css_grammar",
     ":css_parser",
     "//base",
+    "//cobalt/browser:test_dependencies_on_browser",
     "//cobalt/cssom",
     "//cobalt/dom",
     "//cobalt/test:run_all_unittests",
diff --git a/cobalt/cssom/BUILD.gn b/cobalt/cssom/BUILD.gn
index e5b1d47a7f1c..04dae86c766b 100644
--- a/cobalt/cssom/BUILD.gn
+++ b/cobalt/cssom/BUILD.gn
@@ -319,6 +319,7 @@ target(gtest_target_type, "cssom_test") {
 
   deps = [
     "//cobalt/base",
+    "//cobalt/browser:test_dependencies_on_browser",
     "//cobalt/css_parser",
     "//cobalt/cssom",
     "//cobalt/dom",
diff --git a/cobalt/layout/BUILD.gn b/cobalt/layout/BUILD.gn
index 79663654bb55..36c0181aaf3f 100644
--- a/cobalt/layout/BUILD.gn
+++ b/cobalt/layout/BUILD.gn
@@ -140,6 +140,7 @@ target(gtest_target_type, "layout_test") {
   deps = [
     ":layout",
     "//base",
+    "//cobalt//browser:test_dependencies_on_browser",
     "//cobalt/base",
     "//cobalt/css_parser",
     "//cobalt/cssom",
diff --git a/cobalt/loader/BUILD.gn b/cobalt/loader/BUILD.gn
index 2db902d75f34..9b808f9d95e4 100644
--- a/cobalt/loader/BUILD.gn
+++ b/cobalt/loader/BUILD.gn
@@ -195,6 +195,7 @@ target(gtest_target_type, "loader_test") {
   deps = [
     ":loader",
     "//cobalt/base:base",
+    "//cobalt/browser:test_dependencies_on_browser",
     "//cobalt/dom",
     "//cobalt/dom_parser",
     "//cobalt/math:math",
diff --git a/cobalt/loader/image/sandbox/BUILD.gn b/cobalt/loader/image/sandbox/BUILD.gn
index adf6ab1f74dc..dbfc6a2e8a6e 100644
--- a/cobalt/loader/image/sandbox/BUILD.gn
+++ b/cobalt/loader/image/sandbox/BUILD.gn
@@ -18,10 +18,12 @@
 # This target will build a sandbox application that allows for easy
 # experimentation with the ImageDecoder on any platform.
 target(final_executable_type, "image_decoder_sandbox") {
+  testonly = true
   sources = [ "image_decoder_sandbox.cc" ]
 
   deps = [
     "//cobalt/base",
+    "//cobalt/browser:test_dependencies_on_browser",
     "//cobalt/loader",
     "//cobalt/loader:copy_loader_test_data",
     "//cobalt/math",
diff --git a/cobalt/media/BUILD.gn b/cobalt/media/BUILD.gn
index 813baa2958d3..27d33933882e 100644
--- a/cobalt/media/BUILD.gn
+++ b/cobalt/media/BUILD.gn
@@ -129,6 +129,7 @@ target(gtest_target_type, "media_test") {
   deps = [
     ":media",
     "//base/test:test_support",
+    "//cobalt//browser:test_dependencies_on_browser",
     "//cobalt/base",
     "//cobalt/test:run_all_unittests",
     "//testing/gmock",
diff --git a/cobalt/media/sandbox/BUILD.gn b/cobalt/media/sandbox/BUILD.gn
index 19be83551b45..84d2620bdb9a 100644
--- a/cobalt/media/sandbox/BUILD.gn
+++ b/cobalt/media/sandbox/BUILD.gn
@@ -16,9 +16,11 @@
 # media/renderer interface.
 
 target(final_executable_type, "media_sandbox") {
+  testonly = true
   sources = [ "media2_sandbox.cc" ]
 
   deps = [
+    "//cobalt//browser:test_dependencies_on_browser",
     "//cobalt/base",
     "//cobalt/math",
     "//cobalt/media",
@@ -28,6 +30,7 @@ target(final_executable_type, "media_sandbox") {
 }
 
 target(final_executable_type, "web_media_player_sandbox") {
+  testonly = true
   sources = [
     "format_guesstimator.cc",
     "format_guesstimator.h",
@@ -42,6 +45,7 @@ target(final_executable_type, "web_media_player_sandbox") {
     "//cobalt/base",
 
     # Use test data from demos to avoid keeping two copies of video files.
+    "//cobalt/browser:test_dependencies_on_browser",
     "//cobalt/demos/content:demos_testdata",
     "//cobalt/loader",
     "//cobalt/math",
diff --git a/cobalt/renderer/BUILD.gn b/cobalt/renderer/BUILD.gn
index 2b4ac9df37a4..54d218741fce 100644
--- a/cobalt/renderer/BUILD.gn
+++ b/cobalt/renderer/BUILD.gn
@@ -128,6 +128,7 @@ target(gtest_target_type, "renderer_test") {
     ":renderer",
     ":renderer_headers_only",
     "//base:i18n",
+    "//cobalt//browser:test_dependencies_on_browser",
     "//cobalt/base",
     "//cobalt/loader",
     "//cobalt/math",
diff --git a/cobalt/renderer/sandbox/BUILD.gn b/cobalt/renderer/sandbox/BUILD.gn
index 30d7def06c7b..bf1b00b19187 100644
--- a/cobalt/renderer/sandbox/BUILD.gn
+++ b/cobalt/renderer/sandbox/BUILD.gn
@@ -20,10 +20,12 @@
 # also be useful for visually inspecting the output that the Cobalt
 # renderer is producing.
 target(final_executable_type, "renderer_sandbox") {
+  testonly = true
   sources = [ "renderer_sandbox_main.cc" ]
 
   deps = [
     "//cobalt/base",
+    "//cobalt/browser:test_dependencies_on_browser",
     "//cobalt/math",
     "//cobalt/renderer",
     "//cobalt/renderer/test/scenes",
@@ -39,10 +41,12 @@ target(final_executable_type, "renderer_sandbox") {
 # is constantly animating, which for many implementations can be a
 # performance problem.
 target(final_executable_type, "scaling_text_sandbox") {
+  testonly = true
   sources = [ "scaling_text_sandbox_main.cc" ]
 
   deps = [
     "//cobalt/base",
+    "//cobalt/browser:test_dependencies_on_browser",
     "//cobalt/math",
     "//cobalt/renderer",
     "//cobalt/renderer/test/scenes",
diff --git a/cobalt/ui_navigation/scroll_engine/BUILD.gn b/cobalt/ui_navigation/scroll_engine/BUILD.gn
index 980b3fdbd407..25dc91b8014b 100644
--- a/cobalt/ui_navigation/scroll_engine/BUILD.gn
+++ b/cobalt/ui_navigation/scroll_engine/BUILD.gn
@@ -34,6 +34,7 @@ target(gtest_target_type, "scroll_engine_tests") {
   sources = [ "free_scrolling_nav_item_test.cc" ]
   deps = [
     ":scroll_engine",
+    "//cobalt//browser:test_dependencies_on_browser",
     "//cobalt/base",
     "//cobalt/test:run_all_unittests",
     "//testing/gmock",
diff --git a/cobalt/web_animations/BUILD.gn b/cobalt/web_animations/BUILD.gn
index 7ee67ce7addb..6d4f09f41385 100644
--- a/cobalt/web_animations/BUILD.gn
+++ b/cobalt/web_animations/BUILD.gn
@@ -53,6 +53,7 @@ target(gtest_target_type, "web_animations_test") {
 
   deps = [
     ":web_animations",
+    "//cobalt/browser:test_dependencies_on_browser",
     "//cobalt/css_parser",
     "//cobalt/cssom",
     "//cobalt/dom",
diff --git a/cobalt/worker/BUILD.gn b/cobalt/worker/BUILD.gn
index 419369186c3d..4b07e542c8a8 100644
--- a/cobalt/worker/BUILD.gn
+++ b/cobalt/worker/BUILD.gn
@@ -104,6 +104,7 @@ target(gtest_target_type, "worker_test") {
     "//cobalt/browser:browser",
     "//cobalt/browser:generated_bindings",
     "//cobalt/browser:generated_types",
+    "//cobalt/browser:test_dependencies_on_browser",
     "//cobalt/css_parser",
     "//cobalt/cssom",
     "//cobalt/dom/testing:dom_testing",
diff --git a/content/browser/speech/BUILD.gn b/content/browser/speech/BUILD.gn
index 6e5ae3091877..21ba4c7669b3 100644
--- a/content/browser/speech/BUILD.gn
+++ b/content/browser/speech/BUILD.gn
@@ -39,6 +39,7 @@ target(gtest_target_type, "speech_test") {
   ]
   deps = [
     ":speech",
+    "//cobalt//browser:test_dependencies_on_browser",
     "//cobalt/media",
     "//cobalt/test:run_all_unittests",
     "//starboard",