gl: Move platform-specific EGL code into separate files

ui/gl/gl_surface_egl.h

 // Copyright (c) 2012 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_GL_SURFACE_EGL_H_
 #define UI_GL_GL_SURFACE_EGL_H_
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/vsync_provider.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_surface.h"
 
 namespace gfx {
 
+// Get default EGL display for GLSurfaceEGL (differs by platform).
+EGLNativeDisplayType GetPlatformDefaultEGLNativeDisplay();
+
 // Interface for EGL surface.
 class GL_EXPORT GLSurfaceEGL : public GLSurface {
  public:
   GLSurfaceEGL();
 
   // Implement GLSurface.
   virtual EGLDisplay GetDisplay() OVERRIDE;
 
   static bool InitializeOneOff();
   static EGLDisplay GetHardwareDisplay();
   static EGLNativeDisplayType GetNativeDisplay();
 
   // These aren't particularly tied to surfaces, but since we already
   // have the static InitializeOneOff here, it's easiest to reuse its
   // initialization guards.
   static const char* GetEGLExtensions();
   static bool HasEGLExtension(const char* name);
   static bool IsCreateContextRobustnessSupported();
+  static bool IsEGLSurfacelessContextSupported();
 
  protected:
   virtual ~GLSurfaceEGL();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceEGL);
 };
 
 // Encapsulates an EGL surface bound to a view.
 class GL_EXPORT NativeViewGLSurfaceEGL : public GLSurfaceEGL {
@@ skipping 82 matching lines @@
   virtual ~SurfacelessEGL();
 
  private:
   gfx::Size size_;
   DISALLOW_COPY_AND_ASSIGN(SurfacelessEGL);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_SURFACE_EGL_H_