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

ui/gl/gl_context.h

Index: ui/gl/gl_context.h
diff --git a/ui/gl/gl_context.h b/ui/gl/gl_context.h
index 66a763167ba67ca2e505a100b4b863aa0b94b04c..e4d6d5a78a3e1cfbfb9f8c96edb35a9745c994bc 100644
--- a/ui/gl/gl_context.h
+++ b/ui/gl/gl_context.h
@@ -108,6 +108,9 @@ class GL_EXPORT GLContext : public base::RefCounted<GLContext> {
   // 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();
 
@@ -123,9 +126,6 @@ class GL_EXPORT GLContext : public base::RefCounted<GLContext> {
   // 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>;