Move code in ui/gl/* from gfx:: to gl::

ui/gl/angle_platform_impl.cc

 // Copyright 2015 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 "ui/gl/angle_platform_impl.h"
 
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/trace_event/trace_event.h"
 
-namespace gfx {
+namespace gl {
 
 ANGLEPlatformImpl::ANGLEPlatformImpl() {
 }
 
 ANGLEPlatformImpl::~ANGLEPlatformImpl() {
 }
 
 double ANGLEPlatformImpl::currentTime() {
   return base::Time::Now().ToDoubleT();
 }
@@ skipping 78 matching lines @@
 void ANGLEPlatformImpl::histogramSparse(const char* name, int sample) {
   // For sparse histograms, we can use the macro, as it does not incorporate a
   // static.
   UMA_HISTOGRAM_SPARSE_SLOWLY(name, sample);
 }
 
 void ANGLEPlatformImpl::histogramBoolean(const char* name, bool sample) {
   histogramEnumeration(name, sample ? 1 : 0, 2);
 }
 
-}  // namespace gfx
+}  // namespace gl