Reduce internal Flush() in GL resource glGen/Delete APIs.

gpu/command_buffer/client/share_group.h

Index: gpu/command_buffer/client/share_group.h
diff --git a/gpu/command_buffer/client/share_group.h b/gpu/command_buffer/client/share_group.h
index 68ea6a9895a536b10e43d3f996b42eca33724473..8e66c73c76d6886f22f134f42f6eab6e926696f7 100644
--- a/gpu/command_buffer/client/share_group.h
+++ b/gpu/command_buffer/client/share_group.h
@@ -20,6 +20,24 @@ class ProgramInfoManager;
 
 typedef void (GLES2Implementation::*DeleteFn)(GLsizei n, const GLuint* ids);
 
+class ShareGroupContextData {
+ public:
+  struct IdHandlerData {
+    IdHandlerData();
+    ~IdHandlerData();
+
+    std::vector<GLuint> freed_ids_;
+    uint32 flush_generation_;
+  };
+
+  IdHandlerData* id_handler_data(int namespace_id) {
+    return &id_handler_data_[namespace_id];
+  }
+
+ private:
+  IdHandlerData id_handler_data_[id_namespaces::kNumIdNamespaces];
+};
+
 // Base class for IdHandlers
 class IdHandlerInterface {
  public:
@@ -37,7 +55,10 @@ class IdHandlerInterface {
       DeleteFn delete_fn) = 0;
 
   // Marks an id as used for glBind functions. id = 0 does nothing.
-  virtual bool MarkAsUsedForBind(GLuint id) = 0;
+  virtual bool MarkAsUsedForBind(GLES2Implementation* gl_impl, GLuint id) = 0;
+
+  // Called when a context in the share group is destructed.
+  virtual void FreeContext(GLES2Implementation* gl_impl) = 0;
 };
 
 // ShareGroup manages shared resources for contexts that are sharing resources.
@@ -60,6 +81,12 @@ class GLES2_IMPL_EXPORT ShareGroup
     return program_info_manager_.get();
   }
 
+  void FreeContext(GLES2Implementation* gl_impl) {
+    for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
+      id_handlers_[i]->FreeContext(gl_impl);
+    }
+  }
+
  private:
   friend class gpu::RefCountedThreadSafe<ShareGroup>;
   friend class gpu::gles2::GLES2ImplementationTest;