Battery Status API: add testing support for LayoutTests.

content/shell/renderer/test_runner/WebTestDelegate.h

Index: content/shell/renderer/test_runner/WebTestDelegate.h
diff --git a/content/shell/renderer/test_runner/WebTestDelegate.h b/content/shell/renderer/test_runner/WebTestDelegate.h
index 353d13f95b80f478d47b16c2885ea3019382c25b..31a9ad79f25bc8e7a8cba7820d5d316e17c0f50a 100644
--- a/content/shell/renderer/test_runner/WebTestDelegate.h
+++ b/content/shell/renderer/test_runner/WebTestDelegate.h
@@ -15,6 +15,7 @@
 #define WEBTESTRUNNER_NEW_HISTORY_CAPTURE
 
 namespace blink {
+class WebBatteryStatus;
 class WebDeviceMotionData;
 class WebDeviceOrientationData;
 class WebFrame;
@@ -59,6 +60,9 @@ public:
     // Reset the screen orientation data used for testing.
     virtual void resetScreenOrientation() = 0;
 
+    // Notifies blink about a change in battery status.
+    virtual void didChangeBatteryStatus(const blink::WebBatteryStatus&) = 0;
+
     // Add a message to the text dump for the layout test.
     virtual void printMessage(const std::string& message) = 0;