Moved GrClipMaskCache to its own files

https://codereview.appspot.com/6496055/



git-svn-id: http://skia.googlecode.com/svn/trunk@5331 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrClipMaskCache.cpp b/src/gpu/GrClipMaskCache.cpp
new file mode 100644
index 0000000..b7cfb65
--- /dev/null
+++ b/src/gpu/GrClipMaskCache.cpp
@@ -0,0 +1,22 @@
+
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrClipMaskCache.h"
+
+GrClipMaskCache::GrClipMaskCache()
+    : fContext(NULL)
+    , fStack(sizeof(GrClipStackFrame)) {
+    // We need an initial frame to capture the clip state prior to
+    // any pushes
+    SkNEW_PLACEMENT(fStack.push_back(), GrClipStackFrame);
+}
+
+void GrClipMaskCache::push() {
+    SkNEW_PLACEMENT(fStack.push_back(), GrClipStackFrame);
+}
+