flag to use const& instead of const* for src-rect

BUG=skia:

Review URL: https://codereview.chromium.org/1272713005
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 342f79f..4f5e159 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -1846,6 +1846,7 @@
     this->onDrawImage(image, x, y, paint);
 }
 
+#ifdef SK_SUPPORT_LEGACY_SRCPTR_DRAWIMAGERECT
 void SkCanvas::drawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
                              const SkPaint* paint, SrcRectConstraint constraint) {
     if (dst.isEmpty()) {
@@ -1853,20 +1854,47 @@
     }
     this->onDrawImageRect(image, src, dst, paint, constraint);
 }
+void SkCanvas::drawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
+                              const SkPaint* paint, SrcRectConstraint constraint) {
+    if (bitmap.drawsNothing() || dst.isEmpty()) {
+        return;
+    }
+    this->onDrawBitmapRect(bitmap, src, dst, paint, constraint);
+}
+#endif
+
+void SkCanvas::drawImageRect(const SkImage* image, const SkRect& src, const SkRect& dst,
+                             const SkPaint* paint, SrcRectConstraint constraint) {
+    if (dst.isEmpty() || src.isEmpty()) {
+        return;
+    }
+    this->onDrawImageRect(image, &src, dst, paint, constraint);
+}
 
 void SkCanvas::drawImageRect(const SkImage* image, const SkIRect& isrc, const SkRect& dst,
                              const SkPaint* paint, SrcRectConstraint constraint) {
-    SkRect src = SkRect::Make(isrc);
-    this->drawImageRect(image, &src, dst, paint, constraint);
+    this->drawImageRect(image, SkRect::Make(isrc), dst, paint, constraint);
 }
 
+#ifdef SK_SUPPORT_LEGACY_SIMPLE_DRAWIMAGERECT
+void SkCanvas::drawImageRect(const SkImage* image, const SkRect& dst, const SkPaint* paint) {
+    this->drawImageRect(image, SkRect::MakeIWH(image->width(), image->height()), dst, paint);
+}
+#else
+void SkCanvas::drawImageRect(const SkImage* image, const SkRect& dst, const SkPaint* paint,
+                             SrcRectConstraint constraint) {
+    this->drawImageRect(image, SkRect::MakeIWH(image->width(), image->height()), dst, paint,
+                        constraint);
+}
+#endif
+
 void SkCanvas::drawImageNine(const SkImage* image, const SkIRect& center, const SkRect& dst,
                              const SkPaint* paint) {
     if (dst.isEmpty()) {
         return;
     }
     if (!SkNinePatchIter::Valid(image->width(), image->height(), center)) {
-        this->drawImageRect(image, NULL, dst, paint);
+        this->drawImageRect(image, dst, paint);
     }
     this->onDrawImageNine(image, center, dst, paint);
 }
@@ -1878,20 +1906,31 @@
     this->onDrawBitmap(bitmap, dx, dy, paint);
 }
 
-void SkCanvas::drawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
+void SkCanvas::drawBitmapRect(const SkBitmap& bitmap, const SkRect& src, const SkRect& dst,
                               const SkPaint* paint, SrcRectConstraint constraint) {
-    if (bitmap.drawsNothing() || dst.isEmpty()) {
+    if (bitmap.drawsNothing() || dst.isEmpty() || src.isEmpty()) {
         return;
     }
-    this->onDrawBitmapRect(bitmap, src, dst, paint, constraint);
+    this->onDrawBitmapRect(bitmap, &src, dst, paint, constraint);
 }
 
 void SkCanvas::drawBitmapRect(const SkBitmap& bitmap, const SkIRect& isrc, const SkRect& dst,
                               const SkPaint* paint, SrcRectConstraint constraint) {
-    SkRect src = SkRect::Make(isrc);
-    this->drawBitmapRect(bitmap, &src, dst, paint, constraint);
+    this->drawBitmapRect(bitmap, SkRect::Make(isrc), dst, paint, constraint);
 }
 
+#ifdef SK_SUPPORT_LEGACY_SIMPLE_DRAWIMAGERECT
+void SkCanvas::drawBitmapRect(const SkBitmap& bitmap, const SkRect& dst, const SkPaint* paint) {
+    this->drawBitmapRect(bitmap, SkRect::MakeIWH(bitmap.width(), bitmap.height()), dst, paint);
+}
+#else
+void SkCanvas::drawBitmapRect(const SkBitmap& bitmap, const SkRect& dst, const SkPaint* paint,
+                              SrcRectConstraint constraint) {
+    this->drawBitmapRect(bitmap, SkRect::MakeIWH(bitmap.width(), bitmap.height()), dst, paint,
+                         constraint);
+}
+#endif
+
 void SkCanvas::drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center, const SkRect& dst,
                               const SkPaint* paint) {
     if (bitmap.drawsNothing() || dst.isEmpty()) {
@@ -1922,6 +1961,25 @@
     this->onDrawAtlas(atlas, xform, tex, colors, count, mode, cull, paint);
 }
 
+void SkCanvas::legacy_drawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst,
+                                    const SkPaint* paint, SrcRectConstraint constraint) {
+    if (src) {
+        this->drawImageRect(image, *src, dst, paint, constraint);
+    } else {
+        this->drawImageRect(image, SkRect::MakeIWH(image->width(), image->height()),
+                            dst, paint, constraint);
+    }
+}
+void SkCanvas::legacy_drawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst,
+                                     const SkPaint* paint, SrcRectConstraint constraint) {
+    if (src) {
+        this->drawBitmapRect(bitmap, *src, dst, paint, constraint);
+    } else {
+        this->drawBitmapRect(bitmap, SkRect::MakeIWH(bitmap.width(), bitmap.height()),
+                             dst, paint, constraint);
+    }
+}
+
 //////////////////////////////////////////////////////////////////////////////
 //  These are the virtual drawing methods
 //////////////////////////////////////////////////////////////////////////////
diff --git a/src/core/SkPicturePlayback.cpp b/src/core/SkPicturePlayback.cpp
index 2338374..eb7c476 100644
--- a/src/core/SkPicturePlayback.cpp
+++ b/src/core/SkPicturePlayback.cpp
@@ -188,7 +188,7 @@
             const SkRect* src = get_rect_ptr(reader);   // may be null
             const SkRect& dst = reader->skipT<SkRect>();     // required
             SkCanvas::SrcRectConstraint constraint = (SkCanvas::SrcRectConstraint)reader->readInt();
-            canvas->drawBitmapRect(bitmap, src, dst, paint, constraint);
+            canvas->legacy_drawBitmapRect(bitmap, src, dst, paint, constraint);
         } break;
         case DRAW_BITMAP_MATRIX: {
             const SkPaint* paint = fPictureData->getPaint(reader);
@@ -260,7 +260,7 @@
                 // newer op-code stores the constraint explicitly
                 constraint = (SkCanvas::SrcRectConstraint)reader->readInt();
             }
-            canvas->drawImageRect(image, src, dst, paint, constraint);
+            canvas->legacy_drawImageRect(image, src, dst, paint, constraint);
         } break;
         case DRAW_OVAL: {
             const SkPaint& paint = *fPictureData->getPaint(reader);
diff --git a/src/core/SkRecordDraw.cpp b/src/core/SkRecordDraw.cpp
index 25fc2d8..8c884d9 100644
--- a/src/core/SkRecordDraw.cpp
+++ b/src/core/SkRecordDraw.cpp
@@ -89,16 +89,16 @@
 DRAW(DrawBitmap, drawBitmap(r.bitmap.shallowCopy(), r.left, r.top, r.paint));
 DRAW(DrawBitmapNine, drawBitmapNine(r.bitmap.shallowCopy(), r.center, r.dst, r.paint));
 DRAW(DrawBitmapRect,
-        drawBitmapRect(r.bitmap.shallowCopy(), r.src, r.dst, r.paint,
+        legacy_drawBitmapRect(r.bitmap.shallowCopy(), r.src, r.dst, r.paint,
                              SkCanvas::kStrict_SrcRectConstraint));
 DRAW(DrawBitmapRectFast,
-        drawBitmapRect(r.bitmap.shallowCopy(), r.src, r.dst, r.paint,
+        legacy_drawBitmapRect(r.bitmap.shallowCopy(), r.src, r.dst, r.paint,
                        SkCanvas::kFast_SrcRectConstraint));
 DRAW(DrawBitmapRectFixedSize,
-        drawBitmapRect(r.bitmap.shallowCopy(), &r.src, r.dst, &r.paint, r.constraint));
+        legacy_drawBitmapRect(r.bitmap.shallowCopy(), &r.src, r.dst, &r.paint, r.constraint));
 DRAW(DrawDRRect, drawDRRect(r.outer, r.inner, r.paint));
 DRAW(DrawImage, drawImage(r.image, r.left, r.top, r.paint));
-DRAW(DrawImageRect, drawImageRect(r.image, r.src, r.dst, r.paint, r.constraint));
+DRAW(DrawImageRect, legacy_drawImageRect(r.image, r.src, r.dst, r.paint, r.constraint));
 DRAW(DrawImageNine, drawImageNine(r.image, r.center, r.dst, r.paint));
 DRAW(DrawOval, drawOval(r.oval, r.paint));
 DRAW(DrawPaint, drawPaint(r.paint));