DO NOT REVIEW Bindings and plumbing for push messaging API.

public/web/WebViewClient.h

Index: public/web/WebViewClient.h
diff --git a/public/web/WebViewClient.h b/public/web/WebViewClient.h
index 4c8053177828dff7d1a81f965b6ff4dac6909f91..4af59f94464673ecde7e7085ad26963ae3c728ac 100644
--- a/public/web/WebViewClient.h
+++ b/public/web/WebViewClient.h
@@ -69,6 +69,7 @@ class WebKeyboardEvent;
 class WebMIDIClient;
 class WebNode;
 class WebNotificationPresenter;
+class WebPushClient;
 class WebRange;
 class WebSpeechInputController;
 class WebSpeechInputListener;
@@ -394,6 +395,10 @@ public:
 
     virtual WebMIDIClient* webMIDIClient() { return 0; }
 
+    // Push Messaging -------------------------------------------------------
+
+    virtual WebPushClient* webPushClient() { return 0; }
+
 
     // Content detection ----------------------------------------------------