make set3DMask virtual, so we can safely notify the shadercontext
also boost preallocated storage to account for this combo of bitmapshader + emboss + colorfilter
BUG=skia:
R=djsollen@google.com
Author: reed@google.com
Review URL: https://codereview.chromium.org/563563002
diff --git a/src/core/SkBitmapProcShader.h b/src/core/SkBitmapProcShader.h
index d445f56..d293c50 100644
--- a/src/core/SkBitmapProcShader.h
+++ b/src/core/SkBitmapProcShader.h
@@ -73,7 +73,7 @@
// an Sk3DBlitter in SkDraw.cpp
// Note that some contexts may contain other contexts (e.g. for compose shaders), but we've not
// yet found a situation where the size below isn't big enough.
-typedef SkSmallAllocator<3, 768> SkTBlitterAllocator;
+typedef SkSmallAllocator<3, 1024> SkTBlitterAllocator;
// If alloc is non-NULL, it will be used to allocate the returned SkShader, and MUST outlive
// the SkShader.