Battery Status API: add testing support for LayoutTests.

content/shell/renderer/test_runner/test_runner.h

Index: content/shell/renderer/test_runner/test_runner.h
diff --git a/content/shell/renderer/test_runner/test_runner.h b/content/shell/renderer/test_runner/test_runner.h
index 49206c13aa5c7936ef139ca628de7ac4b22bbd53..86c92f6a1e612708b63850ec7bfbb4e8ec0118e8 100644
--- a/content/shell/renderer/test_runner/test_runner.h
+++ b/content/shell/renderer/test_runner/test_runner.h
@@ -300,6 +300,12 @@ class TestRunner : public WebTestRunner,
 
   void SetMockScreenOrientation(const std::string& orientation);
 
+  void DidChangeBatteryStatus(bool charging,
+                              double chargingTime,
+                              double dischargingTime,
+                              double level);
+  void ResetBatteryStatus();
+
   void DidAcquirePointerLock();
   void DidNotAcquirePointerLock();
   void DidLosePointerLock();