Implemented new fence syncs which replaces the old sync points.

gpu/command_buffer/service/in_process_command_buffer.cc

Index: gpu/command_buffer/service/in_process_command_buffer.cc
diff --git a/gpu/command_buffer/service/in_process_command_buffer.cc b/gpu/command_buffer/service/in_process_command_buffer.cc
index 9711aad60051632cd5b488da0e7a67afb1e9900a..0d93190a00dfe7647bb5f24afe87512a5d8c604a 100644
--- a/gpu/command_buffer/service/in_process_command_buffer.cc
+++ b/gpu/command_buffer/service/in_process_command_buffer.cc
@@ -19,6 +19,7 @@
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
+#include "gpu/command_buffer/common/gles2_cmd_format.h"
 #include "gpu/command_buffer/common/value_state.h"
 #include "gpu/command_buffer/service/command_buffer_service.h"
 #include "gpu/command_buffer/service/context_group.h"
@@ -182,6 +183,8 @@ InProcessCommandBuffer::InProcessCommandBuffer(
       image_factory_(nullptr),
       last_put_offset_(-1),
       gpu_memory_buffer_manager_(nullptr),
+      next_fence_sync_release_(1),
+      flushed_fence_sync_release_(0),
       flush_event_(false, false),
       service_(GetInitialService(service)),
       gpu_thread_weak_ptr_factory_(this) {
@@ -559,6 +562,8 @@ void InProcessCommandBuffer::Flush(int32 put_offset) {
                                   put_offset,
                                   order_num);
   QueueTask(task);
+
+  flushed_fence_sync_release_ = next_fence_sync_release_ - 1;
 }
 
 void InProcessCommandBuffer::OrderingBarrier(int32 put_offset) {
@@ -797,8 +802,14 @@ void InProcessCommandBuffer::RetireSyncPointOnGpuThread(uint32 sync_point) {
       base::AutoLock lock(command_buffer_lock_);
       make_current_success = MakeCurrent();
     }
-    if (make_current_success)
-      mailbox_manager->PushTextureUpdates(sync_point);
+    if (make_current_success) {
+      gles2::SyncToken sync_token = {
+        GetNamespaceID(),
+        GetCommandBufferID(),
+        sync_point
+      };
+      mailbox_manager->PushTextureUpdates(sync_token);
+    }
   }
   service_->sync_point_manager()->RetireSyncPoint(sync_point);
 }
@@ -816,7 +827,12 @@ bool InProcessCommandBuffer::WaitSyncPointOnGpuThread(unsigned sync_point) {
   service_->sync_point_manager()->WaitSyncPoint(sync_point);
   gles2::MailboxManager* mailbox_manager =
       decoder_->GetContextGroup()->mailbox_manager();
-  mailbox_manager->PullTextureUpdates(sync_point);
+  gles2::SyncToken sync_token = {
+    GetNamespaceID(),
+    GetCommandBufferID(),
+    sync_point
+  };
+  mailbox_manager->PullTextureUpdates(sync_token);
   return true;
 }
 
@@ -880,6 +896,18 @@ uint64_t InProcessCommandBuffer::GetCommandBufferID() const {
   return command_buffer_id_;
 }
 
+uint32_t InProcessCommandBuffer::GenerateFenceSyncRelease() {
+  return next_fence_sync_release_++;
+}
+
+bool InProcessCommandBuffer::IsFenceSyncRelease(uint32_t release) {
+  return release != 0 && release < next_fence_sync_release_;
+}
+
+bool InProcessCommandBuffer::IsFenceSyncFlushed(uint32_t release) {
+  return release <= flushed_fence_sync_release_;
+}
+
 uint32 InProcessCommandBuffer::CreateStreamTextureOnGpuThread(
     uint32 client_texture_id) {
 #if defined(OS_ANDROID)