Drop frontbuffers for hibernated tabs using image_transport_surface_win.

BUG=112842
TEST=Manual

Review URL: http://codereview.chromium.org/9317056

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@121598 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 10 insertions, 5 deletions

diff --git a/ui/gfx/gl/gl_surface.cc b/ui/gfx/gl/gl_surface.cc
index 858fb93b..47f6d6a 100644
--- a/ui/gfx/gl/gl_surface.cc
+++ b/ui/gfx/gl/gl_surface.cc
@@ -107,7 +107,7 @@ bool GLSurface::OnMakeCurrent(GLContext* context) {
   return true;
 }
 
-void GLSurface::SetVisible(bool visible) {
+void GLSurface::SetVisibility(VisibilityState visibility_state) {
 }
 
 void* GLSurface::GetShareHandle() {
@@ -188,8 +188,8 @@ bool GLSurfaceAdapter::OnMakeCurrent(GLContext* context) {
   return surface_->OnMakeCurrent(context);
 }
 
-void GLSurfaceAdapter::SetVisible(bool visible) {
-  surface_->SetVisible(visible);
+void GLSurfaceAdapter::SetVisibility(VisibilityState visibility_state) {
+  surface_->SetVisibility(visibility_state);
 }
 
 void* GLSurfaceAdapter::GetShareHandle() {
diff --git a/ui/gfx/gl/gl_surface.h b/ui/gfx/gl/gl_surface.h
index ca2b8df..c5c62cb 100644
--- a/ui/gfx/gl/gl_surface.h
+++ b/ui/gfx/gl/gl_surface.h
@@ -73,7 +73,12 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
 
   // This gives a hint as to whether this surface is visible. If it is not
   // visible, the backing store need not be preserved.
-  virtual void SetVisible(bool visible);
+  enum VisibilityState {
+    VISIBILITY_STATE_FOREGROUND,
+    VISIBILITY_STATE_BACKGROUND,
+    VISIBILITY_STATE_HIBERNATED
+  };
+  virtual void SetVisibility(VisibilityState visibility_state);
 
   // Get a handle used to share the surface with another process. Returns null
   // if this is not possible.
@@ -130,7 +135,7 @@ class GL_EXPORT GLSurfaceAdapter : public GLSurface {
   virtual void* GetHandle() OVERRIDE;
   virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;
   virtual bool OnMakeCurrent(GLContext* context) OVERRIDE;
-  virtual void SetVisible(bool visible) OVERRIDE;
+  virtual void SetVisibility(VisibilityState visibility_state) OVERRIDE;
   virtual void* GetShareHandle() OVERRIDE;
   virtual void* GetDisplay() OVERRIDE;
   virtual void* GetConfig() OVERRIDE;