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

ui/gl/gl_version_info.h

Index: ui/gl/gl_version_info.h
diff --git a/ui/gl/gl_version_info.h b/ui/gl/gl_version_info.h
index c8ecb074407d46f11d2ee55543b627fddb728718..13b323faaf3756be4b5c9dbeb02713f66299d5b7 100644
--- a/ui/gl/gl_version_info.h
+++ b/ui/gl/gl_version_info.h
@@ -11,7 +11,7 @@
 namespace gfx {
 
 struct GLVersionInfo {
-  explicit GLVersionInfo(const char* version_str);
+  GLVersionInfo(const char* version_str, const char* renderer_str);
 
   // New flags, such as is_gl4_4 could be introduced as needed.
   // For now, this level of granularity is enough.
@@ -25,6 +25,8 @@ struct GLVersionInfo {
   bool is_gl3;
   bool is_gl4;
 
+  bool is_angle;
+
 private:
   DISALLOW_COPY_AND_ASSIGN(GLVersionInfo);
 };