Add plumbing for testing API for MockWebDeviceMotionHandler injection.

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 a186e191ff4beeee921a6dbbe48902c310626307..c9f192b9e11ba54d1241f460275f6526879ac2bb 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_webapplicationcachehost_impl.h"
 #include "content/renderer/renderer_webkitplatformsupport_impl.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebDeviceMotionListener.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebGamepads.h"
 #include "third_party/WebKit/Tools/DumpRenderTree/chromium/TestRunner/public/WebTestProxy.h"
 
@@ -23,6 +24,7 @@
 #include "content/browser/renderer_host/popup_menu_helper_mac.h"
 #endif
 
+using WebKit::WebDeviceMotionListener;
 using WebKit::WebGamepads;
 using WebTestRunner::WebTestProxy;
 using WebTestRunner::WebTestProxyBase;
@@ -58,6 +60,11 @@ void SetMockGamepads(const WebGamepads& pads) {
   RendererWebKitPlatformSupportImpl::SetMockGamepadsForTesting(pads);
 }
 
+void SetMockDeviceMotionListener(WebDeviceMotionListener* listener) {
+  RendererWebKitPlatformSupportImpl::SetMockDeviceMotionListenerForTesting(
+      listener);
+}
+
 void DisableAppCacheLogging() {
   RendererWebApplicationCacheHostImpl::DisableLoggingForTesting();
 }