Make content text retrieval in ChromeRenderViewObserver never force layout.

content/public/renderer/render_view_observer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_
 #define CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "content/common/content_export.h"
@@ skipping 41 matching lines @@
   virtual void DidCreateDocumentElement(blink::WebLocalFrame* frame) {}
   virtual void FrameCreated(blink::WebLocalFrame* parent,
                             blink::WebFrame* frame) {}
   virtual void FrameDetached(blink::WebFrame* frame) {}
   virtual void FrameWillClose(blink::WebFrame* frame) {}
   virtual void PrintPage(blink::WebLocalFrame* frame, bool user_initiated) {}
   virtual void FocusedNodeChanged(const blink::WebNode& node) {}
   virtual void DraggableRegionsChanged(blink::WebFrame* frame) {}
   virtual void DidCommitCompositorFrame() {}
   virtual void DidUpdateLayout() {}
+  virtual void DidFirstLayoutAfterFinishedParsing() {}

[nasko, 2015/08/24 22:59:05]

We shouldn't be putting any new members on RenderViewObserver, as we are trying
to kill it. RenderFrameObserver should be used instead.

 
   // These match the RenderView methods.
   virtual void DidHandleGestureEvent(const blink::WebGestureEvent& event) {}
 
   virtual void OnMouseDown(const blink::WebNode& mouse_down_node) {}
 
   // These match incoming IPCs.
   virtual void Navigate(const GURL& url) {}
   virtual void ClosePage() {}
 
@@ skipping 34 matching lines @@
   RenderView* render_view_;
   // The routing ID of the associated RenderView.
   int routing_id_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_