Update from https://crrev.com/308331

skia/ext/skia_utils_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "skia/ext/skia_utils_mac.h"
 
 #import <AppKit/AppKit.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_cftyperef.h"
@@ skipping 358 matching lines @@
     return;
   if (useDeviceBits_) {
     bitmap_.unlockPixels();
   } else if (!bitmapIsDummy_) {
     // Find the bits that were drawn to.
     SkIRect bounds = computeDirtyRect();
     SkBitmap subset;
     if (!bitmap_.extractSubset(&subset, bounds)) {
         return;
     }
-    // Neutralize the global matrix by concatenating the inverse. In the
-    // future, Skia may provide some mechanism to set the device portion of
-    // the matrix to identity without clobbering any hosting matrix (e.g., the
-    // picture's matrix).
-    const SkMatrix& skMatrix = canvas_->getTotalMatrix();
-    SkMatrix inverse;
-    if (!skMatrix.invert(&inverse))
-      return;
+    subset.setImmutable();  // Prevents a defensive copy inside Skia.
     canvas_->save();
-    canvas_->concat(inverse);
+    canvas_->setMatrix(SkMatrix::I());  // Reset back to device space.
     canvas_->translate(bounds.x() + bitmapOffset_.x(),
                        bounds.y() + bitmapOffset_.y());
     canvas_->scale(1.f / bitmapScaleFactor_, 1.f / bitmapScaleFactor_);
     canvas_->drawBitmap(subset, 0, 0);
     canvas_->restore();
   }
   CGContextRelease(cgContext_);
   cgContext_ = 0;
   useDeviceBits_ = false;
   bitmapIsDummy_ = false;
@@ skipping 61 matching lines @@
   CGContextConcatCTM(cgContext_, SkMatrixToCGAffineTransform(matrix));
   
   return cgContext_;
 }
 
 bool SkiaBitLocker::hasEmptyClipRegion() const {
   return canvas_->isClipEmpty();
 }
 
 }  // namespace gfx