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

ui/gl/gl_implementation_mac.cc

Index: ui/gl/gl_implementation_mac.cc
diff --git a/ui/gl/gl_implementation_mac.cc b/ui/gl/gl_implementation_mac.cc
index 25b0297d8f036533d0f4f7b8d4fb7e324ed5e852..60cb12ac99435566625a138f2ea266ba44a1fd28 100644
--- a/ui/gl/gl_implementation_mac.cc
+++ b/ui/gl/gl_implementation_mac.cc
@@ -2,15 +2,25 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/gl/gl_implementation.h"
-
+#include "base/base_paths.h"
 #include "base/command_line.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_context_stub_with_extensions.h"
 #include "ui/gl/gl_gl_api_implementation.h"
+#include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_osmesa_api_implementation.h"
 
 namespace gl {
+namespace {
+const char kOpenGLFrameworkPath[] =
+    "/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL";
+}  // namespace
 
 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
@@ -20,6 +30,88 @@
   impls->push_back(kGLImplementationDesktopGL);
   impls->push_back(kGLImplementationAppleGL);
   impls->push_back(kGLImplementationOSMesaGL);
+}
+
+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: {
+      // 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();
+      break;
+    }
+    case kGLImplementationDesktopGL:
+    case kGLImplementationDesktopGLCoreProfile:
+    case kGLImplementationAppleGL: {
+      base::NativeLibrary library = base::LoadNativeLibrary(
+          base::FilePath(kOpenGLFrameworkPath), NULL);
+      if (!library) {
+        LOG(ERROR) << "OpenGL framework not found";
+        return false;
+      }
+
+      AddGLNativeLibrary(library);
+      SetGLImplementation(implementation);
+
+      InitializeStaticGLBindingsGL();
+      break;
+    }
+    case kGLImplementationMockGL: {
+      SetGLImplementation(kGLImplementationMockGL);
+      InitializeStaticGLBindingsGL();
+      break;
+    }
+    default:
+      return false;
+  }
+
+  return true;
 }
 
 bool InitializeDynamicGLBindings(GLImplementation implementation,
@@ -37,9 +129,8 @@
             new GLContextStubWithExtensions());
         mock_context->SetGLVersionString("3.0");
         InitializeDynamicGLBindingsGL(mock_context.get());
-      } else {
+      } else
         InitializeDynamicGLBindingsGL(context);
-      }
       break;
     default:
       return false;
@@ -48,6 +139,19 @@
   return true;
 }
 
+void InitializeDebugGLBindings() {
+  InitializeDebugGLBindingsGL();
+  InitializeDebugGLBindingsOSMESA();
+}
+
+void ClearGLBindings() {
+  ClearGLBindingsGL();
+  ClearGLBindingsOSMESA();
+  SetGLImplementation(kGLImplementationNone);
+
+  UnloadGLNativeLibraries();
+}
+
 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
   return false;
 }