Implement the content/renderer and content/browser part of the Device Motion API.

content/renderer/renderer_webkitplatformsupport_impl.cc

Index: content/renderer/renderer_webkitplatformsupport_impl.cc
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.cc b/content/renderer/renderer_webkitplatformsupport_impl.cc
index 8b13436e71395cc23adca7b5d147aaba6bc7b1e6..6679c6d6952f501e15f8a0dfc254bb1c1ecb215d 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.cc
+++ b/content/renderer/renderer_webkitplatformsupport_impl.cc
@@ -27,6 +27,7 @@
 #include "content/common/view_messages.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/renderer/content_renderer_client.h"
+#include "content/renderer/device_orientation/device_motion_event_pump.h"
 #include "content/renderer/dom_storage/webstoragenamespace_impl.h"
 #include "content/renderer/gamepad_shared_memory_reader.h"
 #include "content/renderer/hyphenator/hyphenator.h"
@@ -1056,4 +1057,15 @@ WebKit::WebString RendererWebKitPlatformSupportImpl::convertIDNToUnicode(
   return net::IDNToUnicode(host.utf8(), languages.utf8());
 }
 
+//------------------------------------------------------------------------------
+
+void RendererWebKitPlatformSupportImpl::setDeviceMotionListener(
+    WebKit::WebDeviceMotionListener* listener) {
+  if (!device_motion_event_pump_) {
+    device_motion_event_pump_.reset(new DeviceMotionEventPump);
+    device_motion_event_pump_->Attach(RenderThreadImpl::current());
+  }
+  device_motion_event_pump_->SetListener(listener);
+}
+
 }  // namespace content