Add plumbing for platform based Device Motion testing.

content/shell/renderer/webkit_test_runner.h

Index: content/shell/renderer/webkit_test_runner.h
diff --git a/content/shell/renderer/webkit_test_runner.h b/content/shell/renderer/webkit_test_runner.h
index 2f815b97255378eaa6b59cebf4f138522e989e61..866f4e5e4cb6d68845a2141b27f1e26139a0d9c6 100644
--- a/content/shell/renderer/webkit_test_runner.h
+++ b/content/shell/renderer/webkit_test_runner.h
@@ -20,6 +20,7 @@
 class SkCanvas;
 
 namespace WebKit {
+class WebDeviceMotionData;
 struct WebRect;
 }
 
@@ -51,6 +52,7 @@ class WebKitTestRunner : public RenderViewObserver,
   virtual void setEditCommand(const std::string& name,
                               const std::string& value);
   virtual void setGamepadData(const WebKit::WebGamepads& gamepads);
+  virtual void setDeviceMotionData(const WebKit::WebDeviceMotionData& data);
   virtual void printMessage(const std::string& message);
   virtual void postTask(::WebTestRunner::WebTask* task);
   virtual void postDelayedTask(::WebTestRunner::WebTask* task,