Add plumbing for platform based Device Motion testing.

content/shell/renderer/webkit_test_runner.cc

Index: content/shell/renderer/webkit_test_runner.cc
diff --git a/content/shell/renderer/webkit_test_runner.cc b/content/shell/renderer/webkit_test_runner.cc
index 87d00a95cece0336ec946738c3c90d149b1a7b18..1126d563aacaf8308cb0c9e764457fa764d71136 100644
--- a/content/shell/renderer/webkit_test_runner.cc
+++ b/content/shell/renderer/webkit_test_runner.cc
@@ -64,6 +64,7 @@ using WebKit::Platform;
 using WebKit::WebArrayBufferView;
 using WebKit::WebContextMenuData;
 using WebKit::WebDevToolsAgent;
+using WebKit::WebDeviceMotionData;
 using WebKit::WebDeviceOrientation;
 using WebKit::WebElement;
 using WebKit::WebFrame;
@@ -211,6 +212,10 @@ void WebKitTestRunner::setGamepadData(const WebGamepads& gamepads) {
   SetMockGamepads(gamepads);
 }
 
+void WebKitTestRunner::setDeviceMotionData(const WebDeviceMotionData& data) {
+  SetMockDeviceMotionData(data);
+}
+
 void WebKitTestRunner::printMessage(const std::string& message) {
   Send(new ShellViewHostMsg_PrintMessage(routing_id(), message));
 }