Implement the Blink part of the Device Motion API.

Tools/DumpRenderTree/chromium/TestRunner/src/WebTestProxy.cpp

Index: Tools/DumpRenderTree/chromium/TestRunner/src/WebTestProxy.cpp
diff --git a/Tools/DumpRenderTree/chromium/TestRunner/src/WebTestProxy.cpp b/Tools/DumpRenderTree/chromium/TestRunner/src/WebTestProxy.cpp
index 99d4ae92b5e32e25117adfd9436db13ed04e6ad5..7707a2f827a14160804d48fccdb4e6e497f569c9 100644
--- a/Tools/DumpRenderTree/chromium/TestRunner/src/WebTestProxy.cpp
+++ b/Tools/DumpRenderTree/chromium/TestRunner/src/WebTestProxy.cpp
@@ -33,6 +33,7 @@
 
 #include "AccessibilityControllerChromium.h"
 #include "EventSender.h"
+#include "MockWebDeviceMotionListener.h"
 #include "MockWebSpeechInputController.h"
 #include "MockWebSpeechRecognizer.h"
 #include "SpellCheckClient.h"
@@ -686,6 +687,13 @@ WebDeviceOrientationClientMock* WebTestProxyBase::deviceOrientationClientMock()
     return m_deviceOrientationClient.get();
 }
 
+MockWebDeviceMotionListener* WebTestProxyBase::deviceMotionListenerMock()
+{
+    if (!m_deviceMotionListener.get())
+        m_deviceMotionListener.reset(new MockWebDeviceMotionListener());
+    return m_deviceMotionListener.get();
+}
+
 #if ENABLE_INPUT_SPEECH
 MockWebSpeechInputController* WebTestProxyBase::speechInputControllerMock()
 {