Reland of [DevTools] Move screen orientation override to RenderWidgetScreenMetricsEmulator.

components/test_runner/mock_screen_orientation_client.h

Index: components/test_runner/mock_screen_orientation_client.h
diff --git a/components/test_runner/mock_screen_orientation_client.h b/components/test_runner/mock_screen_orientation_client.h
index ad868541ca17b2b4a1d6fd1f4c52beabf98d1cc2..15cb81d489c6ad17add20f484f8b74be1a5a6987 100644
--- a/components/test_runner/mock_screen_orientation_client.h
+++ b/components/test_runner/mock_screen_orientation_client.h
@@ -31,6 +31,7 @@
 
   blink::WebScreenOrientationType CurrentOrientationType() const;
   unsigned CurrentOrientationAngle() const;
+  bool is_active() const { return is_active_; }
 
  private:
   // From blink::WebScreenOrientationClient.
@@ -51,6 +52,7 @@
   blink::WebScreenOrientationLockType current_lock_;
   blink::WebScreenOrientationType device_orientation_;
   blink::WebScreenOrientationType current_orientation_;
+  bool is_active_;
 
   DISALLOW_COPY_AND_ASSIGN(MockScreenOrientationClient);
 };