gpu: Add traces to Produce/Consume texture.

Currently consume is expensive. Also, we currently
have no other way of detecting compositor frames
being produced/consumed in the GPU process.

BUG=220561
NOTRY=true

No try since the aura failure isn't related.

Review URL: https://chromiumcodereview.appspot.com/12888005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@189962 0039d316-1c4b-4281-b951-d872f2087c98

gpu/command_buffer/service/gles2_cmd_decoder.cc

@@ -9965,6 +9965,10 @@ error::Error GLES2DecoderImpl::HandleGenMailboxCHROMIUM(
 
 void GLES2DecoderImpl::DoProduceTextureCHROMIUM(GLenum target,
                                                 const GLbyte* mailbox) {
+  TRACE_EVENT2("gpu", "GLES2DecoderImpl::DoProduceTextureCHROMIUM",
+      "context", GetLogPrefix(),
+      "mailbox[0]", static_cast<unsigned char>(mailbox[0]));
+
   Texture* texture = GetTextureInfoForTarget(target);
   if (!texture) {
     LOCAL_SET_GL_ERROR(
@@ -10000,6 +10004,10 @@ void GLES2DecoderImpl::DoProduceTextureCHROMIUM(GLenum target,
 
 void GLES2DecoderImpl::DoConsumeTextureCHROMIUM(GLenum target,
                                                 const GLbyte* mailbox) {
+  TRACE_EVENT2("gpu", "GLES2DecoderImpl::DoConsumeTextureCHROMIUM",
+      "context", GetLogPrefix(),
+      "mailbox[0]", static_cast<unsigned char>(mailbox[0]));
+
   Texture* texture = GetTextureInfoForTarget(target);
   if (!texture) {
     LOCAL_SET_GL_ERROR(