Make blink media logging verbose on Chromecast

third_party/WebKit/Source/core/BUILD.gn

Index: third_party/WebKit/Source/core/BUILD.gn
diff --git a/third_party/WebKit/Source/core/BUILD.gn b/third_party/WebKit/Source/core/BUILD.gn
index 3f191eb4fc5b69f40a1a53143ef5a3e4c06a262b..09671fb43c9ee46df48c9a68ccac7de9895981a2 100644
--- a/third_party/WebKit/Source/core/BUILD.gn
+++ b/third_party/WebKit/Source/core/BUILD.gn
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import("//build/config/chrome_build.gni")
+import("//build/config/chromecast_build.gni")
 import("//build/config/ui.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/bindings/core/v8/generated.gni")
@@ -51,6 +52,10 @@ config("config") {
     # Suppress __declspec(dllexport)/extern conflict (C4910).
     cflags += [ "/wd4910" ]
   }
+
+  if (is_chromecast) {
+    defines += [ "BLINK_MEDIA_LOG=DVLOG(2)" ]
+  }
 }
 core_config_add += [ ":config" ]