Use EXT_robustness where available on GLES2 platforms to detect and respond to resets of the graphi…

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
@@ skipping 23 matching lines @@
   GLSurfaceEGL();
 
   // Implement GLSurface.
   virtual EGLDisplay GetDisplay() OVERRIDE;
 
   static bool InitializeOneOff();
   static EGLDisplay GetHardwareDisplay();
   static EGLDisplay GetSoftwareDisplay();
   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();
+
  protected:
   virtual ~GLSurfaceEGL();
 
   bool software_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceEGL);
 };
 
 // Encapsulates an EGL surface bound to a view.
@@ skipping 47 matching lines @@
  private:
   gfx::Size size_;
   EGLSurface surface_;
 
   DISALLOW_COPY_AND_ASSIGN(PbufferGLSurfaceEGL);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_SURFACE_EGL_H_