Move EmptyString, kWhitespace and the BOM to base.

gpu/command_buffer/service/gpu_tracer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/gpu_tracer.h"
 
 #include <deque>
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
@@ skipping 253 matching lines @@
   while (!traces_.empty() && traces_.front()->IsAvailable()) {
     traces_.front()->Process();
     traces_.pop_front();
   }
 
   IssueProcessTask();
 }
 
 const std::string& GPUTracerImpl::CurrentName() const {
   if (!current_trace_.get())
-    return EmptyString();
+    return base::EmptyString();
   return current_trace_->name();
 }
 
 scoped_refptr<Trace> GPUTracerImpl::CreateTrace(const std::string& name) {
   return new NoopTrace(name);
 }
 
 void GPUTracerImpl::IssueProcessTask() {
   if (traces_.empty() || process_posted_)
     return;
@@ skipping 53 matching lines @@
 }  // namespace
 
 scoped_ptr<GPUTracer> GPUTracer::Create() {
   if (gfx::g_driver_gl.ext.b_GL_ARB_timer_query)
     return scoped_ptr<GPUTracer>(new GPUTracerARBTimerQuery());
   return scoped_ptr<GPUTracer>(new GPUTracerImpl());
 }
 
 }  // namespace gles2
 }  // namespace gpu