Move GL one-off initialization code.

ui/gl/init/gl_initializer_mac.cc

+// Copyright 2016 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/init/gl_initializer.h"
+
+#include <OpenGL/CGLRenderers.h>
+
+#include <vector>
+
+#include "base/logging.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_implementation.h"
+#include "ui/gl/gl_surface.h"
+#include "ui/gl/gpu_switching_manager.h"
+
+namespace gl {
+namespace init {
+
+namespace {
+
+bool InitializeOneOffForSandbox() {
+  static bool initialized = false;
+  if (initialized)
+    return true;
+
+  // This is called from the sandbox warmup code on Mac OS X.
+  // GPU-related stuff is very slow without this, probably because
+  // the sandbox prevents loading graphics drivers or some such.
+  std::vector<CGLPixelFormatAttribute> attribs;
+  if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus()) {
+    // Avoid switching to the discrete GPU just for this pixel
+    // format selection.
+    attribs.push_back(kCGLPFAAllowOfflineRenderers);
+  }
+  if (GetGLImplementation() == kGLImplementationAppleGL) {
+    attribs.push_back(kCGLPFARendererID);
+    attribs.push_back(
+        static_cast<CGLPixelFormatAttribute>(kCGLRendererGenericFloatID));
+  }
+  attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
+
+  CGLPixelFormatObj format;
+  GLint num_pixel_formats;
+  if (CGLChoosePixelFormat(&attribs.front(), &format, &num_pixel_formats) !=
+      kCGLNoError) {
+    LOG(ERROR) << "Error choosing pixel format.";
+    return false;
+  }
+  if (!format) {
+    LOG(ERROR) << "format == 0.";
+    return false;
+  }
+  CGLReleasePixelFormat(format);
+  DCHECK_NE(num_pixel_formats, 0);
+  initialized = true;
+  return true;
+}
+
+}  // namespace
+
+bool InitializeGLOneOffPlatform() {
+  switch (GetGLImplementation()) {
+    case kGLImplementationDesktopGL:
+    case kGLImplementationDesktopGLCoreProfile:
+    case kGLImplementationAppleGL:
+      if (!InitializeOneOffForSandbox()) {
+        LOG(ERROR) << "GLSurfaceCGL::InitializeOneOff failed.";
+        return false;
+      }
+      return true;
+    default:
+      return true;
+  }
+}
+
+}  // namespace init
+}  // namespace gl