Add `SkIRect bounds()` convenience method to SkImageInfo and SkBitmap.

src/pdf/SkPDFDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFDevice.h"
 
 #include "SkAnnotation.h"
@@ skipping 727 matching lines @@
     NOT_IMPLEMENTED(initialTransform.hasPerspective(), true);
 
     // Skia generally uses the top left as the origin but PDF natively has the
     // origin at the bottom left. This matrix corrects for that.  But that only
     // needs to be done once, we don't do it when layering.
     fInitialTransform.setTranslate(0, SkIntToScalar(pageSize.fHeight));
     fInitialTransform.preScale(SK_Scalar1, -SK_Scalar1);
     fInitialTransform.preConcat(initialTransform);
     fLegacyBitmap.setInfo(info);
 
-    SkIRect existingClip = SkIRect::MakeWH(info.width(), info.height());
+    SkIRect existingClip = info.bounds();
     fExistingClipRegion.setRect(existingClip);
     this->init();
 }
 
 // TODO(vandebo) change layerSize to SkSize.
 SkPDFDevice::SkPDFDevice(const SkISize& layerSize,
                          const SkClipStack& existingClipStack,
                          const SkRegion& existingClipRegion)
     : fPageSize(layerSize)
     , fContentSize(layerSize)
@@ skipping 1415 matching lines @@
         clipRegion = &perspectiveBounds;
         srcRect = NULL;
         bitmap = &perspectiveBitmap;
     }
 
     SkMatrix scaled;
     // Adjust for origin flip.
     scaled.setScale(SK_Scalar1, -SK_Scalar1);
     scaled.postTranslate(0, SK_Scalar1);
     // Scale the image up from 1x1 to WxH.
-    SkIRect subset = SkIRect::MakeWH(bitmap->width(), bitmap->height());
+    SkIRect subset = bitmap->bounds();
     scaled.postScale(SkIntToScalar(subset.width()),
                      SkIntToScalar(subset.height()));
     scaled.postConcat(matrix);
     ScopedContentEntry content(this, clipStack, *clipRegion, scaled, paint);
     if (!content.entry() || (srcRect && !subset.intersect(*srcRect))) {
         return;
     }
     if (content.needShape()) {
         SkPath shape;
         shape.addRect(SkRect::MakeWH(SkIntToScalar(subset.width()),
                                      SkIntToScalar( subset.height())));
         shape.transform(matrix);
         content.setShape(shape);
     }
     if (!content.needSource()) {
         return;
     }
 
     SkAutoTUnref<SkPDFObject> image(
             SkPDFCreateImageObject(*bitmap, subset, fEncoder));
     if (!image) {
         return;
     }
 
     SkPDFUtils::DrawFormXObject(this->addXObjectResource(image.get()),
                                 &content.entry()->fContent);
 }