Implemented new fence syncs which replaces the old sync points.

gpu/command_buffer/common/gles2_cmd_format.h

Index: gpu/command_buffer/common/gles2_cmd_format.h
diff --git a/gpu/command_buffer/common/gles2_cmd_format.h b/gpu/command_buffer/common/gles2_cmd_format.h
index e4d00dd41ea7ee54d64e191e1db885e06dc05020..e502b5ed036c838b844885938eda8ce0b299bf85 100644
--- a/gpu/command_buffer/common/gles2_cmd_format.h
+++ b/gpu/command_buffer/common/gles2_cmd_format.h
@@ -18,6 +18,7 @@
 #include "base/macros.h"
 #include "gpu/command_buffer/common/bitfield_helpers.h"
 #include "gpu/command_buffer/common/cmd_buffer_common.h"
+#include "gpu/command_buffer/common/constants.h"
 #include "gpu/command_buffer/common/gles2_cmd_ids.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 
@@ -202,6 +203,23 @@ struct UniformsES3Header {
   // UniformES3Info uniforms[num_uniforms];
 };
 
+// The format of fence sync tokens.
+struct SyncToken {
+  CommandBufferNamespace namespace_id;
+  uint64_t command_buffer_id;
+  uint32_t release_count;
+
+  bool operator<(const SyncToken& other) const {
+    // TODO(dyen): Once all our compilers support c++11, we can replace this
+    // long list of comparisons with std::tie().
+    return (namespace_id < other.namespace_id) ||
+           ((namespace_id == other.namespace_id) &&
+            ((command_buffer_id < other.command_buffer_id) ||
+             ((command_buffer_id == other.command_buffer_id) &&
+              (release_count < other.release_count))));
+  }
+};
+
 // The format of QuerySync used by EXT_occlusion_query_boolean
 struct QuerySync {
   void Reset() {