Add plumbing for platform based Device Motion testing.

content/test/layouttest_support.cc

Index: content/test/layouttest_support.cc
diff --git a/content/test/layouttest_support.cc b/content/test/layouttest_support.cc
index 19939173f0fc3fb05d6aa11d9413102165564a05..26983301ce7afa3b68dc8b78fd973d9a10fb1a03 100644
--- a/content/test/layouttest_support.cc
+++ b/content/test/layouttest_support.cc
@@ -12,6 +12,7 @@
 #include "content/renderer/render_view_impl.h"
 #include "content/renderer/renderer_webkitplatformsupport_impl.h"
 #include "content/test/test_media_stream_client.h"
+#include "third_party/WebKit/public/platform/WebDeviceMotionData.h"
 #include "third_party/WebKit/public/platform/WebGamepads.h"
 #include "third_party/WebKit/public/testing/WebFrameTestProxy.h"
 #include "third_party/WebKit/public/testing/WebTestProxy.h"
@@ -24,6 +25,7 @@
 #include "content/browser/renderer_host/popup_menu_helper_mac.h"
 #endif
 
+using WebKit::WebDeviceMotionData;
 using WebKit::WebGamepads;
 using WebKit::WebRect;
 using WebKit::WebSize;
@@ -77,6 +79,10 @@ void SetMockGamepads(const WebGamepads& pads) {
   RendererWebKitPlatformSupportImpl::SetMockGamepadsForTesting(pads);
 }
 
+void SetMockDeviceMotionData(const WebDeviceMotionData& data) {
+  RendererWebKitPlatformSupportImpl::SetMockDeviceMotionDataForTesting(data);
+}
+
 void EnableRendererLayoutTestMode() {
   RenderThreadImpl::current()->set_layout_test_mode(true);
 }