Split GL binding init into core and extension part

ui/gfx/gl/gl_implementation_linux.cc

Index: ui/gfx/gl/gl_implementation_linux.cc
diff --git a/ui/gfx/gl/gl_implementation_linux.cc b/ui/gfx/gl/gl_implementation_linux.cc
index dea5d44008e0ad5d7701b389a1d4714a39772775..c7a971a43a3cb5d9c4dc9014820ad6a553758515 100644
--- a/ui/gfx/gl/gl_implementation_linux.cc
+++ b/ui/gfx/gl/gl_implementation_linux.cc
@@ -175,6 +175,31 @@ bool InitializeGLBindings(GLImplementation implementation) {
   return true;
 }
 
+bool InitializeGLExtensionBindings(GLImplementation implementation,
+    GLContext* context) {
+  switch (implementation) {
+    case kGLImplementationOSMesaGL:
+      InitializeGLExtensionBindingsGL(context);
+      InitializeGLExtensionBindingsOSMESA(context);
+      break;
+    case kGLImplementationDesktopGL:
+      InitializeGLExtensionBindingsGL(context);
+      InitializeGLExtensionBindingsGLX(context);
+      break;
+    case kGLImplementationEGLGLES2:
+      InitializeGLExtensionBindingsGL(context);
+      InitializeGLExtensionBindingsEGL(context);
+      break;
+    case kGLImplementationMockGL:
+      InitializeGLExtensionBindingsGL(context);
+      break;
+    default:
+      return false;
+  }
+
+  return true;
+}
+
 void InitializeDebugGLBindings() {
   InitializeDebugGLBindingsEGL();
   InitializeDebugGLBindingsGL();