aw: Fix clearView implementation

android_webview/browser/browser_view_renderer.h

 // Copyright (c) 2013 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 ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_
 
 #include "android_webview/browser/parent_compositor_draw_constraints.h"
 #include "android_webview/browser/shared_renderer_state.h"
 #include "base/callback.h"
@@ skipping 87 matching lines @@
   virtual void DidOverscroll(gfx::Vector2dF accumulated_overscroll,
                              gfx::Vector2dF latest_overscroll_delta,
                              gfx::Vector2dF current_fling_velocity) override;
 
   void UpdateParentDrawConstraints();
   void DidSkipCommitFrame();
   void InvalidateOnFunctorDestroy();
 
  private:
   void SetTotalRootLayerScrollOffset(gfx::Vector2dF new_value_dip);
+  bool CanOnDraw();
   // Checks the continuous invalidate and block invalidate state, and schedule
   // invalidates appropriately. If |force_invalidate| is true, then send a view
   // invalidate regardless of compositor expectation. If |skip_reschedule_tick|
   // is true and if there is already a pending fallback tick, don't reschedule
   // them.
   void EnsureContinuousInvalidation(bool force_invalidate,
                                     bool skip_reschedule_tick);
   bool CompositeSW(SkCanvas* canvas);
   void DidComposite();
   void DidSkipCompositeInDraw();
@@ skipping 74 matching lines @@
   // visible skew (especially noticeable when scrolling up and down in the same
   // spot over a period of time).
   gfx::Vector2dF overscroll_rounding_error_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserViewRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_