cc: Make PaintCanvas abstract

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
index 7e642f9a342dc3e6c15a1fc1a8a5e0ecebcdb6f9..633df72db2143dc74d4e8042d50eeb7bf1c862bd 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp
@@ -1222,7 +1222,7 @@ void GraphicsLayer::checkPaintUnderInvalidations(const PaintRecord& newRecord) {
   oldBitmap.allocPixels(
       SkImageInfo::MakeN32Premul(rect.width(), rect.height()));
   {
-    PaintCanvas canvas(oldBitmap);
+    SkiaPaintCanvas canvas(oldBitmap);
     canvas.clear(SK_ColorTRANSPARENT);
     canvas.translate(-rect.x(), -rect.y());
     canvas.drawPicture(tracking->lastPaintedRecord.get());
@@ -1232,7 +1232,7 @@ void GraphicsLayer::checkPaintUnderInvalidations(const PaintRecord& newRecord) {
   newBitmap.allocPixels(
       SkImageInfo::MakeN32Premul(rect.width(), rect.height()));
   {
-    PaintCanvas canvas(newBitmap);
+    SkiaPaintCanvas canvas(newBitmap);
     canvas.clear(SK_ColorTRANSPARENT);
     canvas.translate(-rect.x(), -rect.y());
     canvas.drawPicture(&newRecord);