WIP RasterCanvasLayerAllocator experiment 2

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index e53a104c47fa28406f1d440dbcd670365d877a24..0bea28288394821e099f8bc4b5c61029bd7422f9 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -752,6 +752,17 @@ SkCanvas::SkCanvas(SkBaseDevice* device)
     this->init(device, kDefault_InitFlags);
 }
 
+SkCanvas::SkCanvas(SkBaseDevice* device, SkRasterCanvasLayerAllocator* allocator)
+    : fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage))
+    , fProps(device->surfaceProps())
+    , fConservativeRasterClip(false)
+    , fLayerAllocator(allocator)
+{
+    inc_canvas();
+
+    this->init(device, kDefault_InitFlags);
+}
+
 SkCanvas::SkCanvas(SkBaseDevice* device, InitFlags flags)
     : fMCStack(sizeof(MCRec), fMCRecStorage, sizeof(fMCRecStorage))
     , fProps(device->surfaceProps())
@@ -1266,7 +1277,7 @@ void SkCanvas::internalSaveLayer(const SaveLayerRec& rec, SaveLayerStrategy stra
         const SkBaseDevice::TileUsage usage = SkBaseDevice::kNever_TileUsage;
         const SkBaseDevice::CreateInfo createInfo = SkBaseDevice::CreateInfo(info, usage, geo,
                                                                              preserveLCDText);
-        newDevice.reset(priorDevice->onCreateDevice(createInfo, paint));
+        newDevice.reset(priorDevice->onCreateDevice(createInfo, paint, fLayerAllocator.get()));
         if (!newDevice) {
             SkErrorInternals::SetError(kInternalError_SkError,
                                        "Unable to create device for layer.");