Make numTextures() be non-virtual on GrCustomStage.

R=tomhudson@google.com,robertphillips@google.com,senorblanco@chromium.org
Review URL: https://codereview.appspot.com/6586081

git-svn-id: http://skia.googlecode.com/svn/trunk@5805 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/gradients/SkGradientShader.cpp b/src/effects/gradients/SkGradientShader.cpp
index 9a965ff..cc7e13c 100644
--- a/src/effects/gradients/SkGradientShader.cpp
+++ b/src/effects/gradients/SkGradientShader.cpp
@@ -719,7 +719,7 @@
 GrGradientEffect::GrGradientEffect(GrContext* ctx,
                                    const SkGradientShaderBase& shader,
                                    SkShader::TileMode tileMode)
-    : fUseTexture (true) {
+    : INHERITED(1) {
     // TODO: check for simple cases where we don't need a texture:
     //GradientInfo info;
     //shader.asAGradient(&info);
@@ -765,12 +765,8 @@
     }
 }
 
-int GrGradientEffect::numTextures() const {
-    return fUseTexture ? 1 : 0;
-}
-
 const GrTextureAccess& GrGradientEffect::textureAccess(int index) const {
-    GrAssert(fUseTexture && 0 == index);
+    GrAssert(0 == index);
     return fTextureAccess;
 }