WIP RasterCanvasLayerAllocator experiment 2

skia/ext/platform_canvas.h

Index: skia/ext/platform_canvas.h
diff --git a/skia/ext/platform_canvas.h b/skia/ext/platform_canvas.h
index 452a575cc86887b34edebe44662e5e1a791ee240..4909cb29f53c35b256074fd7e0871be8d17f234c 100644
--- a/skia/ext/platform_canvas.h
+++ b/skia/ext/platform_canvas.h
@@ -25,6 +25,8 @@ class SkBaseDevice;
 
 namespace skia {
 
+class LayerAllocator;
+
 //
 //  Note about error handling.
 //
@@ -45,6 +47,7 @@ enum OnFailureType {
 #if defined(WIN32)
   // The shared_section parameter is passed to gfx::PlatformDevice::create.
   // See it for details.
+  // TODO: this should become sk_sp<SkCanvas>
   SK_API SkCanvas* CreatePlatformCanvas(int width,
                                         int height,
                                         bool is_opaque,
@@ -61,12 +64,14 @@ enum OnFailureType {
                                   int y,
                                   const RECT* src_rect);
 #elif defined(__APPLE__)
+  // TODO: this should become sk_sp<SkCanvas>
   SK_API SkCanvas* CreatePlatformCanvas(CGContextRef context,
                                         int width,
                                         int height,
                                         bool is_opaque,
                                         OnFailureType failure_type);
 
+  // TODO: this should become sk_sp<SkCanvas>
   SK_API SkCanvas* CreatePlatformCanvas(int width,
                                         int height,
                                         bool is_opaque,
@@ -78,6 +83,7 @@ enum OnFailureType {
 
   // Construct a canvas from the given memory region. The memory is not cleared
   // first. @data must be, at least, @height * StrideForWidth(@width) bytes.
+  // TODO: this should become sk_sp<SkCanvas>
   SK_API SkCanvas* CreatePlatformCanvas(int width,
                                         int height,
                                         bool is_opaque,
@@ -91,9 +97,6 @@ static inline SkCanvas* CreatePlatformCanvas(int width,
   return CreatePlatformCanvas(width, height, is_opaque, 0, CRASH_ON_FAILURE);
 }
 
-SK_API SkCanvas* CreateCanvas(const sk_sp<SkBaseDevice>& device,
-                              OnFailureType failure_type);
-
 static inline SkCanvas* CreateBitmapCanvas(int width,
                                            int height,
                                            bool is_opaque) {