Hookup the GPUTrace events.

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 3fc39c6dda1c29f787f7a8648d00baa58d85d481..66739841c0d7485013cfdb3729514cc4b7bf94ed 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -40,7 +40,7 @@
 #include "gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.h"
 #include "gpu/command_buffer/service/gles2_cmd_validation.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
-#include "gpu/command_buffer/service/gpu_trace.h"
+#include "gpu/command_buffer/service/gpu_tracer.h"
 #include "gpu/command_buffer/service/image_manager.h"
 #include "gpu/command_buffer/service/mailbox_manager.h"
 #include "gpu/command_buffer/service/memory_tracking.h"
@@ -1671,7 +1671,7 @@ class GLES2DecoderImpl : public GLES2Decoder {
   base::TimeDelta total_texture_upload_time_;
   base::TimeDelta total_processing_commands_time_;
 
-  std::stack<linked_ptr<GPUTrace> > gpu_trace_stack_;
+  scoped_ptr<GPUTracer> gpu_tracer_;
 
   DISALLOW_COPY_AND_ASSIGN(GLES2DecoderImpl);
 };
@@ -2118,6 +2118,8 @@ bool GLES2DecoderImpl::Initialize(
   DCHECK(context->IsCurrent(surface.get()));
   DCHECK(!context_.get());
 
+  gpu_tracer_ = GPUTracer::Create();
+
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableGPUDebugging)) {
     set_debug(true);
@@ -6782,6 +6784,7 @@ error::Error GLES2DecoderImpl::HandlePostSubBufferCHROMIUM(
                "glPostSubBufferCHROMIUM", "command not supported by surface");
     return error::kNoError;
   }
+
   if (surface_->PostSubBuffer(c.x, c.y, c.width, c.height)) {
     return error::kNoError;
   } else {
@@ -9646,24 +9649,23 @@ error::Error GLES2DecoderImpl::HandleTraceBeginCHROMIUM(
   if (!bucket->GetAsString(&command_name)) {
     return error::kInvalidArguments;
   }
-
-  linked_ptr<GPUTrace> trace(new GPUTrace(command_name));
-  trace->EnableStartTrace();
-  gpu_trace_stack_.push(trace);
-
+  TRACE_EVENT_COPY_ASYNC_BEGIN0("gpu", command_name.c_str(), this);
+  if (!gpu_tracer_->Begin(command_name)) {
+    SetGLError(GL_INVALID_OPERATION,
+               "glTraceBeginCHROMIUM", "unable to create begin trace");
+    return error::kNoError;

[jonathan.backer, 2012/12/14 20:48:29]

Why return here rather than the next line?

[dsinclair, 2012/12/14 21:26:04]

Paranoia? I originally had code after this if block. Left the return in in case
we added code after again. Wanted to make sure this would return.

+  }
   return error::kNoError;
 }
 
 void GLES2DecoderImpl::DoTraceEndCHROMIUM() {
-  if (gpu_trace_stack_.empty()) {
+  if (gpu_tracer_->CurrentName().empty()) {
     SetGLError(GL_INVALID_OPERATION,
                "glTraceEndCHROMIUM", "no trace begin found");
     return;
   }
-
-  linked_ptr<GPUTrace> trace = gpu_trace_stack_.top();
-  trace->EnableEndTrace();
-  gpu_trace_stack_.pop();
+  TRACE_EVENT_COPY_ASYNC_END0("gpu", gpu_tracer_->CurrentName().c_str(), this);
+  gpu_tracer_->End();
 }
 
 error::Error GLES2DecoderImpl::HandleAsyncTexImage2DCHROMIUM(