Added an abstract Renderer::clear method.

TRAC #22041

Unimplemented in Renderer11 and Renderer9 only forces the depth stencil state
to reset.

Signed-off-by: Shannon Woods
Signed-off-by: Daniel Koch

Author:    Geoff Lang

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1423 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/Context.cpp b/src/libGLESv2/Context.cpp
index 658c721..b7fa89d 100644
--- a/src/libGLESv2/Context.cpp
+++ b/src/libGLESv2/Context.cpp
@@ -2824,6 +2824,9 @@
     {
         mDevice->Clear(0, NULL, flags, color, depth, stencil);
     }
+
+    mRenderer->clear(mask, mState.colorClearValue, mState.depthClearValue, mState.stencilClearValue,
+                     framebufferObject);
 }
 
 void Context::drawArrays(GLenum mode, GLint first, GLsizei count, GLsizei instances)