Adds platform support for DeviceMotion tests in WebKit

webkit/support/test_webkit_platform_support.cc

Index: webkit/support/test_webkit_platform_support.cc
diff --git a/webkit/support/test_webkit_platform_support.cc b/webkit/support/test_webkit_platform_support.cc
index 1a98ab2d5c53c8151bdf79846c14b8ecf4d6c8e2..78a5e620493882439b926c90234917782f7de1ee 100644
--- a/webkit/support/test_webkit_platform_support.cc
+++ b/webkit/support/test_webkit_platform_support.cc
@@ -166,6 +166,14 @@ WebKit::WebClipboard* TestWebKitPlatformSupport::clipboard() {
   return &mock_clipboard_;
 }
 
+WebKit::WebDeviceMotionDetector*
+TestWebKitPlatformSupport::deviceMotionDetector() {
+  if (shadow_platform_delegate_)
+    return shadow_platform_delegate_->deviceMotionDetector();
+
+  return webkit_glue::WebKitPlatformSupportImpl::deviceMotionDetector();
+}
+
 WebKit::WebFileUtilities* TestWebKitPlatformSupport::fileUtilities() {
   return &file_utilities_;
 }