Update from https://crrev.com/320343

ui/gl/angle_platform_impl.h

+// 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.
+
+#ifndef UI_GL_ANGLE_PLATFORM_IMPL_H_
+#define UI_GL_ANGLE_PLATFORM_IMPL_H_
+
+// Implements the ANGLE platform interface, for functionality like
+// histograms and trace profiling.
+
+#include "base/macros.h"
+#include "third_party/angle/include/platform/Platform.h"
+
+namespace gfx {
+
+// Derives the base ANGLE platform and provides implementations
+class ANGLEPlatformImpl : public angle::Platform {
+ public:
+  ANGLEPlatformImpl();
+  ~ANGLEPlatformImpl() override;
+
+  // angle::Platform:
+  void histogramCustomCounts(const char* name,
+                             int sample,
+                             int min,
+                             int max,
+                             int bucket_count) override;
+  void histogramEnumeration(const char* name,
+                            int sample,
+                            int boundary_value) override;
+  void histogramSparse(const char* name, int sample) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ANGLEPlatformImpl);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_ANGLE_PLATFORM_IMPL_H_