Add a helper method to return the native format backing a GL texture type.

TRAC #23844

Signed-off-by: Geoff Lang
Signed-off-by: Shannon Woods
diff --git a/src/libGLESv2/renderer/Renderer.h b/src/libGLESv2/renderer/Renderer.h
index 6fb0bf6..dde569e 100644
--- a/src/libGLESv2/renderer/Renderer.h
+++ b/src/libGLESv2/renderer/Renderer.h
@@ -265,6 +265,7 @@
                                          GLenum destinationFormat, GLenum sourcePixelsType, const gl::Box &destArea) = 0;
 
     virtual bool getLUID(LUID *adapterLuid) const = 0;
+    virtual GLint getNativeTextureFormat(GLint internalFormat) const = 0;
 
   protected:
     bool initializeCompiler();