Tiling priorities in Android Webview.

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/global_tile_manager.h"
 #include "android_webview/browser/global_tile_manager_client.h"
+#include "android_webview/browser/parent_compositor_draw_constraints.h"
 #include "android_webview/browser/shared_renderer_state.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/callback.h"
 #include "base/cancelable_callback.h"
 #include "base/values.h"
 #include "content/public/browser/android/synchronous_compositor.h"
 #include "content/public/browser/android/synchronous_compositor_client.h"
 #include "skia/ext/refptr.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/vector2d_f.h"
@@ skipping 113 matching lines @@
   virtual bool IsExternalFlingActive() const OVERRIDE;
   virtual void DidOverscroll(gfx::Vector2dF accumulated_overscroll,
                              gfx::Vector2dF latest_overscroll_delta,
                              gfx::Vector2dF current_fling_velocity) OVERRIDE;
 
   // GlobalTileManagerClient overrides.
   virtual size_t GetNumTiles() const OVERRIDE;
   virtual void SetNumTiles(size_t num_tiles,
                            bool effective_immediately) OVERRIDE;
 
- private:
-  void SetTotalRootLayerScrollOffset(gfx::Vector2dF new_value_dip);
   // 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.
   void EnsureContinuousInvalidation(bool force_invalidate);
+
+  // Post an invalidate if the parent draw constraints are stale and there is
+  // no pending invalidate.
+  void InvalidateOnceIfNeeded();
+
+ private:
+  void SetTotalRootLayerScrollOffset(gfx::Vector2dF new_value_dip);
   bool OnDrawSoftware(jobject java_canvas);
   bool CompositeSW(SkCanvas* canvas);
   void DidComposite();
   scoped_ptr<base::Value> RootLayerStateAsValue(
       const gfx::Vector2dF& total_scroll_offset_dip,
       const gfx::SizeF& scrollable_size_dip);
 
   bool OnDrawHardware(jobject java_canvas);
   void ReturnUnusedResource(scoped_ptr<DrawGLInput> input);
   void ReturnResourceFromParent();
@@ skipping 33 matching lines @@
   bool attached_to_window_;
   bool hardware_enabled_;
   float dip_scale_;
   float page_scale_factor_;
   bool on_new_picture_enable_;
   bool clear_view_;
 
   gfx::Vector2d last_on_draw_scroll_offset_;
   gfx::Rect last_on_draw_global_visible_rect_;
 
+  // The draw constraints from the parent compositor. These are only used for
+  // tiling priority.
+  ParentCompositorDrawConstraints parent_draw_constraints_;
+
   // When true, we should continuously invalidate and keep drawing, for example
   // to drive animation. This value is set by the compositor and should always
   // reflect the expectation of the compositor and not be reused for other
   // states.
   bool compositor_needs_continuous_invalidate_;
 
   // Used to block additional invalidates while one is already pending.
   bool block_invalidates_;
 
   base::CancelableClosure post_fallback_tick_;
@@ skipping 20 matching lines @@
   // policy on the shared_renderer_state_ atomically.
   size_t num_tiles_;
   size_t num_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserViewRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_