gpu: Add GpuFence framework.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 8be63b095c41b3833ddc5b4f8029d28cf47203c0..440ae669cedd9e9a05d72d4c209cbd9327a1f523 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -36,6 +36,7 @@
 #include "gpu/command_buffer/service/context_state.h"
 #include "gpu/command_buffer/service/error_state.h"
 #include "gpu/command_buffer/service/feature_info.h"
+#include "gpu/command_buffer/service/fence_manager.h"
 #include "gpu/command_buffer/service/framebuffer_manager.h"
 #include "gpu/command_buffer/service/gl_stream_texture_image.h"
 #include "gpu/command_buffer/service/gl_utils.h"
@@ -570,6 +571,7 @@ class GLES2DecoderImpl : public GLES2Decoder, public ErrorStateClient {
     return vertex_array_manager_.get();
   }
   ImageManager* GetImageManager() override { return image_manager_.get(); }
+  FenceManager* GetFenceManager() override { return fence_manager_.get(); }
 
   bool HasPendingQueries() const override;
   void ProcessPendingQueries(bool did_finish) override;
@@ -754,6 +756,8 @@ class GLES2DecoderImpl : public GLES2Decoder, public ErrorStateClient {
 
   ImageManager* image_manager() { return image_manager_.get(); }
 
+  FenceManager* fence_manager() { return fence_manager_.get(); }
+
   VertexArrayManager* vertex_array_manager() {
     return vertex_array_manager_.get();
   }
@@ -2233,6 +2237,8 @@ class GLES2DecoderImpl : public GLES2Decoder, public ErrorStateClient {
 
   std::unique_ptr<ImageManager> image_manager_;
 
+  std::unique_ptr<FenceManager> fence_manager_;
+
   FenceSyncReleaseCallback fence_sync_release_callback_;
   WaitFenceSyncCallback wait_fence_sync_callback_;
   NoParamCallback deschedule_until_finished_callback_;
@@ -3139,6 +3145,8 @@ bool GLES2DecoderImpl::Initialize(
 
   image_manager_.reset(new ImageManager);
 
+  fence_manager_.reset(new FenceManager);
+
   util_.set_num_compressed_texture_formats(
       validators_->compressed_texture_format.GetValues().size());
 
@@ -4760,6 +4768,11 @@ void GLES2DecoderImpl::Destroy(bool have_context) {
 
   image_manager_.reset();
 
+  if (fence_manager_.get()) {
+    fence_manager_->Destroy(have_context);
+    fence_manager_.reset();
+  }
+
   offscreen_target_frame_buffer_.reset();
   offscreen_target_color_texture_.reset();
   offscreen_target_color_render_buffer_.reset();