[Android WebView] OnMemoryPressure to drop tile memory

android_webview/browser/scoped_app_gl_state_restore.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.
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "ui/gl/gl_bindings.h"
 
 namespace gfx {
 class GLContext;
 }
 
 namespace android_webview {
 
 // This class is not thread safe and should only be used on the UI thread.
 class ScopedAppGLStateRestore {
  public:
   enum CallMode {
     MODE_DRAW,
-    MODE_DETACH_FROM_WINDOW
+    MODE_DETACH_FROM_WINDOW,
+    MODE_ON_TRIM

[joth, 2013/10/02 10:47:01]

nit: include the trailing comma on last item

as detach and trim are the same, should they be combined into a single "resource
management" enum? (I think it maybe better to have the enums reflect classes of
use rather than the exact function names it is used from)

[boliu, 2013/10/02 14:09:55]

both done

   };
 
   ScopedAppGLStateRestore(CallMode mode);
   ~ScopedAppGLStateRestore();
 
   bool stencil_enabled() const { return stencil_test_; }
   GLint framebuffer_binding_ext() const { return framebuffer_binding_ext_; }
 
  private:
   const CallMode mode_;
@@ skipping 60 matching lines @@
     GLint texture_external_oes;
     // TODO(boliu): TEXTURE_RECTANGLE_ARB
   };
 
   std::vector<TextureBindings> texture_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedAppGLStateRestore);
 };
 
 }  // namespace android_webview