Added an abstract invalidate method to rx::RenderTarget.

TRAC #23133

Signed-off-by: Jamie Madill
Signed-off-by: Shannon Woods
Author: Geoff Lang

git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2334 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/renderer/RenderTarget11.cpp b/src/libGLESv2/renderer/RenderTarget11.cpp
index 5a1f433..70729fa 100644
--- a/src/libGLESv2/renderer/RenderTarget11.cpp
+++ b/src/libGLESv2/renderer/RenderTarget11.cpp
@@ -386,6 +386,11 @@
     return static_cast<rx::RenderTarget11*>(target);
 }
 
+void RenderTarget11::invalidate(GLint x, GLint y, GLsizei width, GLsizei height)
+{
+    // Currently a no-op
+}
+
 ID3D11Resource *RenderTarget11::getTexture() const
 {
     if (mTexture)