Add RAPPOR metric recording for Device{Orientation,Motion} in blink.

public/platform/Platform.h

Index: public/platform/Platform.h
diff --git a/public/platform/Platform.h b/public/platform/Platform.h
index c30e8d260c924fd0f1bf3ef4b6b7e84bfa786c7f..ff1a1afdc806f6ec389931c13a8ddcae969ee4b8 100644
--- a/public/platform/Platform.h
+++ b/public/platform/Platform.h
@@ -606,6 +606,8 @@ public:
     // longer notify the listener, if any.
     virtual void stopListening(WebPlatformEventType type) { }
 
+    virtual void recordRapporMetric(WebPlatformEventType type, const WebURL& url) { }

[Mike West, 2015/03/23 17:27:30]

Don't we already have "recordRappor"? Why do we need another method?

[timvolodine, 2015/03/23 17:33:30]

I understood from holte@ that there is currently no way to log from blink, i.e.
we need to send IPC to the browser, since rappor metrics have to be recorded on
the browser UI thread.. There is a crbug.com/429901 for this but it has not been
implemented yet.

+
     // This method converts from the supplied DOM code enum to the
     // embedder's DOM code value for the key pressed. |domCode| values are
     // based on the value defined in ui/events/keycodes/dom4/keycode_converter_data.h.