De-virtualize SkCanvas save/restore.

This moves the state management logic into non-virtual SkCanvas methods,
and turns the virtuals into protected notifiers.

R=reed@google.com, robertphillips@google.com

Author: fmalita@chromium.org

Review URL: https://codereview.chromium.org/194713008

git-svn-id: http://skia.googlecode.com/svn/trunk@13776 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/SkDumpCanvas.cpp b/src/utils/SkDumpCanvas.cpp
index 4805d62..af59cd638 100644
--- a/src/utils/SkDumpCanvas.cpp
+++ b/src/utils/SkDumpCanvas.cpp
@@ -192,13 +192,13 @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
-int SkDumpCanvas::save(SaveFlags flags) {
+void SkDumpCanvas::willSave(SaveFlags flags) {
     this->dump(kSave_Verb, NULL, "save(0x%X)", flags);
-    return this->INHERITED::save(flags);
+    this->INHERITED::willSave(flags);
 }
 
-int SkDumpCanvas::saveLayer(const SkRect* bounds, const SkPaint* paint,
-                             SaveFlags flags) {
+SkCanvas::SaveLayerStrategy SkDumpCanvas::willSaveLayer(const SkRect* bounds, const SkPaint* paint,
+                                                        SaveFlags flags) {
     SkString str;
     str.printf("saveLayer(0x%X)", flags);
     if (bounds) {
@@ -214,12 +214,12 @@
         }
     }
     this->dump(kSave_Verb, paint, str.c_str());
-    return this->INHERITED::saveLayer(bounds, paint, flags);
+    return this->INHERITED::willSaveLayer(bounds, paint, flags);
 }
 
-void SkDumpCanvas::restore() {
-    this->INHERITED::restore();
+void SkDumpCanvas::willRestore() {
     this->dump(kRestore_Verb, NULL, "restore");
+    this->INHERITED::willRestore();
 }
 
 bool SkDumpCanvas::translate(SkScalar dx, SkScalar dy) {