media: Reorganize media unittests

media/test/BUILD.gn

Index: media/test/BUILD.gn
diff --git a/media/test/BUILD.gn b/media/test/BUILD.gn
index a2e07aa48ea20a1573ac2f85b09a4490518b9937..6e5126724e4346a3f06830ef7045c6afa73f6798 100644
--- a/media/test/BUILD.gn
+++ b/media/test/BUILD.gn
@@ -5,6 +5,24 @@
 import("//media/media_options.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 
+source_set("run_all_unittests") {
+  testonly = true
+  sources = [
+    "run_all_unittests.cc",
+  ]
+
+  deps = [
+    "//base",
+    "//base/test:test_support",
+    "//media",
+    "//media/base:test_support",
+  ]
+
+  if (is_android) {
+    deps += [ "//ui/gl" ]
+  }
+}
+
 source_set("pipeline_integration_test_base") {
   testonly = true