More prep work in Gr for landing AA hairline renderer.

Review URL: http://codereview.appspot.com/4944045



git-svn-id: http://skia.googlecode.com/svn/trunk@2164 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrGpuGLFixed.cpp b/gpu/src/GrGpuGLFixed.cpp
index 87b051b..69bf94f 100644
--- a/gpu/src/GrGpuGLFixed.cpp
+++ b/gpu/src/GrGpuGLFixed.cpp
@@ -62,7 +62,8 @@
 
 GrGpuGLFixed::GrGpuGLFixed(const GrGLInterface* gl)
     : GrGpuGL(gl, get_binding_in_use(gl)) {
-    f4X4DownsampleFilterSupport = false;
+    fShaderSupport = false;
+    fShaderDerivativeSupport = false;
     fDualSourceBlendingSupport = false;
 }