Extract WebFrameClient implementation out of WebTestProxyBase.

components/test_runner/web_test_interfaces.h

Index: components/test_runner/web_test_interfaces.h
diff --git a/components/test_runner/web_test_interfaces.h b/components/test_runner/web_test_interfaces.h
index a163c44558e0560f9823568ed90f4ad3ed2bebda..481c4261f952eb1b87a87e6ce8f28255e9c99de1 100644
--- a/components/test_runner/web_test_interfaces.h
+++ b/components/test_runner/web_test_interfaces.h
@@ -13,6 +13,7 @@ namespace blink {
 class WebAppBannerClient;
 class WebAudioDevice;
 class WebFrame;
+class WebFrameClient;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
 class WebMIDIAccessor;
@@ -28,6 +29,7 @@ namespace test_runner {
 
 class AppBannerClient;
 class TestInterfaces;
+class WebFrameTestClient;
 class WebTestDelegate;
 class WebTestProxyBase;
 class WebTestRunner;
@@ -64,8 +66,15 @@ class TEST_RUNNER_EXPORT WebTestInterfaces {
 
   TestInterfaces* GetTestInterfaces();
 
+  // Gets a borrowed pointer to a WebFrameClient implementation providing
+  // test behavior (i.e. forwarding javascript console output to the test
+  // harness).  The caller should guarantee that the returned pointer
+  // won't be used beyond the lifetime of WebTestInterfaces.
+  blink::WebFrameClient* GetWebFrameTestClient();
+
  private:
   scoped_ptr<TestInterfaces> interfaces_;
+  scoped_ptr<WebFrameTestClient> web_frame_test_client_;
 
   DISALLOW_COPY_AND_ASSIGN(WebTestInterfaces);
 };