Moved SW path rendering to new texture unit

http://codereview.appspot.com/6138057/



git-svn-id: http://skia.googlecode.com/svn/trunk@3813 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrSoftwarePathRenderer.cpp b/src/gpu/GrSoftwarePathRenderer.cpp
index 6780e0f..84dd836 100644
--- a/src/gpu/GrSoftwarePathRenderer.cpp
+++ b/src/gpu/GrSoftwarePathRenderer.cpp
@@ -228,7 +228,7 @@
         GrAssert(NULL != texture);
         GrDrawTarget::AutoDeviceCoordDraw adcd(target, stageMask);
         enum {
-            kPathMaskStage = GrPaint::kTotalStages,
+            kPathMaskStage = GrPaint::kTotalStages+1,
         };
         target->drawState()->setTexture(kPathMaskStage, texture);
         target->drawState()->sampler(kPathMaskStage)->reset();