[Android WebView] OnMemoryPressure to drop tile memory

content/public/browser/android/synchronous_compositor.h

 // Copyright 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 CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "ui/gfx/rect.h"
@@ skipping 13 matching lines @@
 class SynchronousCompositorClient;
 
 struct CONTENT_EXPORT SynchronousCompositorMemoryPolicy {
   // Memory limit for rendering and pre-rendering.
   size_t bytes_limit;
 
   // Limit of number of GL resources used for rendering and pre-rendering.
   size_t num_resources_limit;
 
   SynchronousCompositorMemoryPolicy();
+
+  bool operator==(const SynchronousCompositorMemoryPolicy& other) const;
+  bool operator!=(const SynchronousCompositorMemoryPolicy& other) const;
 };
 
 // Interface for embedders that wish to direct compositing operations
 // synchronously under their own control. Only meaningful when the
 // kEnableSyncrhonousRendererCompositor flag is specified.
 class CONTENT_EXPORT SynchronousCompositor {
  public:
   // Must be called once per WebContents instance. Will create the compositor
   // instance as needed, but only if |client| is non-NULL.
   static void SetClientForWebContents(WebContents* contents,
@@ skipping 40 matching lines @@
   // SynchronousCompositorClient::GetTotalRootLayerScrollOffset).
   virtual void DidChangeRootLayerScrollOffset() = 0;
 
  protected:
   virtual ~SynchronousCompositor() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_H_