[android] Resize the android_webview if it's 0x0 initially.

android_webview/browser/browser_view_renderer.h

Index: android_webview/browser/browser_view_renderer.h
diff --git a/android_webview/browser/browser_view_renderer.h b/android_webview/browser/browser_view_renderer.h
index 6c246bf60cfaea4ba23d2b7dc9cd761c702481e6..5c485f09ee250ec0484c0853392fa61d982142dd 100644
--- a/android_webview/browser/browser_view_renderer.h
+++ b/android_webview/browser/browser_view_renderer.h
@@ -39,6 +39,9 @@ class BrowserViewRenderer {
      // Called to get view's absolute location on the screen.
      virtual gfx::Point GetLocationOnScreen() = 0;
 
+     // Called when the RenderView page scale changes.
+     virtual void OnPageScaleFactorChanged(float page_scale_factor) = 0;
+
    protected:
      virtual ~Client() {}
   };