[WIP] Add Context to SkDrawLooper.

src/core/SkDrawLooper.cpp

Index: src/core/SkDrawLooper.cpp
diff --git a/src/core/SkDrawLooper.cpp b/src/core/SkDrawLooper.cpp
index bac2d969c0505d318fe7881c638c1a4750544fd3..b6c587a0fcd4317179b4d85d8e3e3696065b04d3 100644
--- a/src/core/SkDrawLooper.cpp
+++ b/src/core/SkDrawLooper.cpp
@@ -13,11 +13,12 @@
 
 bool SkDrawLooper::canComputeFastBounds(const SkPaint& paint) {
     SkCanvas canvas;
+    ContextAllocator allocator;
 
-    this->init(&canvas);
+    SkDrawLooper::Context* context = this->init(&canvas, &allocator);
     for (;;) {
         SkPaint p(paint);
-        if (this->next(&canvas, &p)) {
+        if (context->next(&canvas, &p)) {
             p.setLooper(NULL);
             if (!p.canComputeFastBounds()) {
                 return false;
@@ -32,12 +33,13 @@ bool SkDrawLooper::canComputeFastBounds(const SkPaint& paint) {
 void SkDrawLooper::computeFastBounds(const SkPaint& paint, const SkRect& src,
                                      SkRect* dst) {
     SkCanvas canvas;
+    ContextAllocator allocator;
 
     *dst = src;   // catch case where there are no loops
-    this->init(&canvas);
+    SkDrawLooper::Context* context = this->init(&canvas, &allocator);
     for (bool firstTime = true;; firstTime = false) {
         SkPaint p(paint);
-        if (this->next(&canvas, &p)) {
+        if (context->next(&canvas, &p)) {
             SkRect r(src);
 
             p.setLooper(NULL);