Battery Status API: add testing support for LayoutTests.

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 b045da9a3d98955be2334474c3f9d394c126ddf4..19f36f7c0ab5ef2689791461051f5211ea9c0c49 100644
--- a/content/test/layouttest_support.cc
+++ b/content/test/layouttest_support.cc
@@ -18,6 +18,7 @@
 #include "content/shell/renderer/test_runner/TestCommon.h"
 #include "content/shell/renderer/test_runner/web_frame_test_proxy.h"
 #include "content/shell/renderer/test_runner/web_test_proxy.h"
+#include "third_party/WebKit/public/platform/WebBatteryStatus.h"
 #include "third_party/WebKit/public/platform/WebDeviceMotionData.h"
 #include "third_party/WebKit/public/platform/WebDeviceOrientationData.h"
 #include "third_party/WebKit/public/platform/WebGamepads.h"
@@ -27,6 +28,7 @@
 #include "content/browser/renderer_host/popup_menu_helper_mac.h"
 #endif
 
+using blink::WebBatteryStatus;
 using blink::WebDeviceMotionData;
 using blink::WebDeviceOrientationData;
 using blink::WebGamepad;
@@ -114,6 +116,10 @@ void ResetMockScreenOrientation()
   RendererWebKitPlatformSupportImpl::ResetMockScreenOrientationForTesting();
 }
 
+void MockBatteryStatusChanged(const WebBatteryStatus& status) {
+  RendererWebKitPlatformSupportImpl::MockBatteryStatusChanged(status);
+}
+
 void EnableRendererLayoutTestMode() {
   RenderThreadImpl::current()->set_layout_test_mode(true);
 }