Implement support for rendering to 32-bit float textures on ES3

ui/gl/gl_context.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_CONTEXT_H_
 #define UI_GL_GL_CONTEXT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 90 matching lines @@
   // Use this context for virtualization.
   void SetupForVirtualization();
 
   // Make this context current when used for context virtualization.
   bool MakeVirtuallyCurrent(GLContext* virtual_context, GLSurface* surface);
 
   // Notify this context that |virtual_context|, that was using us, is
   // being released or destroyed.
   void OnReleaseVirtuallyCurrent(GLContext* virtual_context);
 
+  // Returns the GL version string. The context must be current.
+  virtual std::string GetGLVersion();
+
  protected:
   virtual ~GLContext();
 
   // Sets the GL api to the real hardware API (vs the VirtualAPI)
   static void SetRealGLApi();
   virtual void SetCurrent(GLSurface* surface);
 
   // Initialize function pointers to functions where the bound version depends
   // on GL version or supported extensions. Should be called immediately after
   // this context is made current.
   bool InitializeDynamicBindings();
 
   // Returns the last real (non-virtual) GLContext made current.
   static GLContext* GetRealCurrent();
 
-  // Returns the GL version string. The context must be current.
-  virtual std::string GetGLVersion();
-
  private:
   friend class base::RefCounted<GLContext>;
 
   // For GetRealCurrent.
   friend class VirtualGLApi;
 
   scoped_refptr<GLShareGroup> share_group_;
   scoped_ptr<VirtualGLApi> virtual_gl_api_;
   scoped_ptr<GLStateRestorer> state_restorer_;
   scoped_ptr<GLVersionInfo> version_info_;
@@ skipping 10 matching lines @@
 
   virtual void SetCurrent(GLSurface* surface) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GLContextReal);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_CONTEXT_H_