Revert of Move static GL binding initialization to //ui/gl/init.

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/base_paths.h"
-#include "base/files/file_path.h"
 #include "base/logging.h"
-#include "base/mac/foundation_util.h"
-#include "base/native_library.h"
-#include "base/path_service.h"
-#include "base/threading/thread_restrictions.h"
 #include "ui/gl/gl_bindings.h"
-#include "ui/gl/gl_gl_api_implementation.h"
 #include "ui/gl/gl_implementation.h"
-#include "ui/gl/gl_osmesa_api_implementation.h"
 #include "ui/gl/gl_surface.h"
 #include "ui/gl/gpu_switching_manager.h"
 
 namespace gl {
 namespace init {
 
 namespace {
 
-const char kOpenGLFrameworkPath[] =
-    "/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL";
-
 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()) {
@@ skipping 18 matching lines @@
   if (!format) {
     LOG(ERROR) << "format == 0.";
     return false;
   }
   CGLReleasePixelFormat(format);
   DCHECK_NE(num_pixel_formats, 0);
   initialized = true;
   return true;
 }
 
-bool InitializeStaticOSMesaInternal() {
-  // osmesa.so is located in the build directory. This code path is only
-  // valid in a developer build environment.
-  base::FilePath exe_path;
-  if (!PathService::Get(base::FILE_EXE, &exe_path)) {
-    LOG(ERROR) << "PathService::Get failed.";
-    return false;
-  }
-  base::FilePath bundle_path = base::mac::GetAppBundlePath(exe_path);
-  // Some unit test targets depend on osmesa but aren't built as app
-  // bundles. In that case, the .so is next to the executable.
-  if (bundle_path.empty())
-    bundle_path = exe_path;
-  base::FilePath build_dir_path = bundle_path.DirName();
-  base::FilePath osmesa_path = build_dir_path.Append("osmesa.so");
-
-  // When using OSMesa, just use OSMesaGetProcAddress to find entry points.
-  base::NativeLibrary library = base::LoadNativeLibrary(osmesa_path, NULL);
-  if (!library) {
-    LOG(ERROR) << "osmesa.so not found at " << osmesa_path.value();
-    return false;
-  }
-
-  GLGetProcAddressProc get_proc_address =
-      reinterpret_cast<GLGetProcAddressProc>(
-          base::GetFunctionPointerFromNativeLibrary(library,
-                                                    "OSMesaGetProcAddress"));
-  if (!get_proc_address) {
-    LOG(ERROR) << "OSMesaGetProcAddress not found.";
-    base::UnloadNativeLibrary(library);
-    return false;
-  }
-
-  SetGLGetProcAddressProc(get_proc_address);
-  AddGLNativeLibrary(library);
-  SetGLImplementation(kGLImplementationOSMesaGL);
-
-  InitializeStaticGLBindingsGL();
-  InitializeStaticGLBindingsOSMESA();
-
-  return true;
-}
-
-bool InitializeStaticCGLInternal(GLImplementation implementation) {
-  base::NativeLibrary library =
-      base::LoadNativeLibrary(base::FilePath(kOpenGLFrameworkPath), nullptr);
-  if (!library) {
-    LOG(ERROR) << "OpenGL framework not found";
-    return false;
-  }
-
-  AddGLNativeLibrary(library);
-  SetGLImplementation(implementation);
-
-  InitializeStaticGLBindingsGL();
-  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;
   }
 }
 
-bool InitializeStaticGLBindings(GLImplementation implementation) {
-  // Prevent reinitialization with a different implementation. Once the gpu
-  // unit tests have initialized with kGLImplementationMock, we don't want to
-  // later switch to another GL implementation.
-  DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
-
-  // Allow the main thread or another to initialize these bindings
-  // after instituting restrictions on I/O. Going forward they will
-  // likely be used in the browser process on most platforms. The
-  // one-time initialization cost is small, between 2 and 5 ms.
-  base::ThreadRestrictions::ScopedAllowIO allow_io;
-
-  switch (implementation) {
-    case kGLImplementationOSMesaGL:
-      return InitializeStaticOSMesaInternal();
-    case kGLImplementationDesktopGL:
-    case kGLImplementationDesktopGLCoreProfile:
-    case kGLImplementationAppleGL:
-      return InitializeStaticCGLInternal(implementation);
-    case kGLImplementationMockGL:
-      SetGLImplementation(kGLImplementationMockGL);
-      InitializeStaticGLBindingsGL();
-      return true;
-    default:
-      NOTREACHED();
-  }
-
-  return false;
-}
-
-void InitializeDebugGLBindings() {
-  InitializeDebugGLBindingsGL();
-  InitializeDebugGLBindingsOSMESA();
-}
-
-void ClearGLBindingsPlatform() {
-  ClearGLBindingsGL();
-  ClearGLBindingsOSMESA();
-}
-
 }  // namespace init
 }  // namespace gl