command_buffer: Defer restoring of FBO bindings when changing virtual contexts

gpu/command_buffer/service/framebuffer_manager.h

Index: gpu/command_buffer/service/framebuffer_manager.h
diff --git a/gpu/command_buffer/service/framebuffer_manager.h b/gpu/command_buffer/service/framebuffer_manager.h
index bb0de013a807c5b251740072bfe69d96cdd1afd2..5b43acd7aa77db5d312188a051ea5f200446f96b 100644
--- a/gpu/command_buffer/service/framebuffer_manager.h
+++ b/gpu/command_buffer/service/framebuffer_manager.h
@@ -235,14 +235,45 @@ class GPU_EXPORT Framebuffer : public base::RefCounted<Framebuffer> {
 struct DecoderFramebufferState {
   DecoderFramebufferState();
   ~DecoderFramebufferState();
+  bool is_draw_binding_dirty() const { return draw_binding_dirty_; }
+  bool is_read_binding_dirty() const { return read_binding_dirty_; }
+
+  void set_draw_framebuffer_clear_state_dirty(bool flag) {
+    draw_framebuffer_clear_state_dirty_ = flag;
+  }
+  bool is_draw_framebuffer_clear_state_dirty() const {
+    return draw_framebuffer_clear_state_dirty_;
+  }
+
+  void set_bound_draw_framebuffer(Framebuffer* framebuffer);
+  void set_bound_read_framebuffer(Framebuffer* framebuffer);
+  Framebuffer* bound_draw_framebuffer() const {
+    return bound_draw_framebuffer_.get();
+  }
+  Framebuffer* bound_read_framebuffer() const {
+    return bound_read_framebuffer_.get();
+  }
+  void SetBoundFramebuffer(GLenum target, Framebuffer* framebuffer);
+  bool IsBindingDirty(GLenum target) const;
+  void MarkBindingDirty(GLenum target);
+  void MarkBindingClean(GLenum target);
+
+  void NotifyFramebufferChanged(Framebuffer* framebuffer);
+  void NotifyBoundFramebuffersChanged();
+
+ private:
+  // OpenGL FBO bindings have been modified and do not reflect
+  // bound_read_framebuffer and bound_draw_framebuffer.
+  bool draw_binding_dirty_;
+  bool read_binding_dirty_;
 
   // State saved for clearing so we can clear render buffers and then
   // restore to these values.
-  bool clear_state_dirty;
+  bool draw_framebuffer_clear_state_dirty_;
 
   // The currently bound framebuffers
-  scoped_refptr<Framebuffer> bound_read_framebuffer;
-  scoped_refptr<Framebuffer> bound_draw_framebuffer;
+  scoped_refptr<Framebuffer> bound_read_framebuffer_;
+  scoped_refptr<Framebuffer> bound_draw_framebuffer_;
 };
 
 // This class keeps track of the frambebuffers and their attached renderbuffers