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

android_webview/renderer/aw_render_view_ext.cc

Index: android_webview/renderer/aw_render_view_ext.cc
diff --git a/android_webview/renderer/aw_render_view_ext.cc b/android_webview/renderer/aw_render_view_ext.cc
index 2e253ef7b70c5e2f5109faf4b648588a335fd815..27a72420bdeb845a8f1a961092ea3b9cd233abd5 100644
--- a/android_webview/renderer/aw_render_view_ext.cc
+++ b/android_webview/renderer/aw_render_view_ext.cc
@@ -127,7 +127,7 @@ void PopulateHitTestData(const GURL& absolute_link_url,
 }  // namespace
 
 AwRenderViewExt::AwRenderViewExt(content::RenderView* render_view)
-    : content::RenderViewObserver(render_view) {
+    : content::RenderViewObserver(render_view), page_scale_factor_(0.0f) {
   render_view->GetWebView()->setPermissionClient(this);
 }
 
@@ -192,6 +192,18 @@ void AwRenderViewExt::DidCommitProvisionalLoad(WebKit::WebFrame* frame,
   }
 }
 
+void AwRenderViewExt::DidCommitCompositorFrame() {
+  UpdatePageScaleFactor();
+}
+
+void AwRenderViewExt::UpdatePageScaleFactor() {
+  if (page_scale_factor_ != render_view()->GetWebView()->pageScaleFactor()) {
+    page_scale_factor_ = render_view()->GetWebView()->pageScaleFactor();
+    Send(new AwViewHostMsg_PageScaleFactorChanged(routing_id(),
+                                                  page_scale_factor_));
+  }
+}
+
 void AwRenderViewExt::FocusedNodeChanged(const WebKit::WebNode& node) {
   if (node.isNull() || !node.isElementNode() || !render_view())
     return;