Replicating LayoutDumpFlags across OOPIFs.

content/shell/renderer/layout_test/blink_test_runner.h

Index: content/shell/renderer/layout_test/blink_test_runner.h
diff --git a/content/shell/renderer/layout_test/blink_test_runner.h b/content/shell/renderer/layout_test/blink_test_runner.h
index cb8de06646896cfbfd073a288c217c1b2cbb8186..e8d840c3e3ccc77d5e51cf5b54525dc19cf8cabf 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.h
+++ b/content/shell/renderer/layout_test/blink_test_runner.h
@@ -24,6 +24,10 @@
 class SkBitmap;
 class SkCanvas;
 
+namespace base {
+class DictionaryValue;
+}
+
 namespace blink {
 class WebDeviceMotionData;
 class WebDeviceOrientationData;
@@ -117,6 +121,8 @@ class BlinkTestRunner : public RenderViewObserver,
   void SetAcceptAllCookies(bool accept) override;
   std::string PathToLocalResource(const std::string& resource) override;
   void SetLocale(const std::string& locale) override;
+  void OnLayoutDumpFlagsChanged(
+      const base::DictionaryValue& changed_values) override;
   void TestFinished() override;
   void CloseRemainingWindows() override;
   void DeleteAllCookies() override;