make allocPixels throw on failure

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 2102 matching lines @@
 
         // TODO(edisonn): A better approach would be to use a bitmap shader
         // (in clamp mode) and draw a rect over the entire bounding box. Then
         // intersect perspectiveOutline to the clip. That will avoid introducing
         // alpha to the image while still giving good behavior at the edge of
         // the image.  Avoiding alpha will reduce the pdf size and generation
         // CPU time some.
 
         const int w = SkScalarCeilToInt(physicalPerspectiveOutline.getBounds().width());
         const int h = SkScalarCeilToInt(physicalPerspectiveOutline.getBounds().height());
-        if (!perspectiveBitmap.allocPixels(SkImageInfo::MakeN32Premul(w, h))) {
+        if (!perspectiveBitmap.tryAllocN32Pixels(w, h)) {
             return;
         }
         perspectiveBitmap.eraseColor(SK_ColorTRANSPARENT);
 
         SkCanvas canvas(perspectiveBitmap);
 
         SkScalar deltaX = bounds.left();
         SkScalar deltaY = bounds.top();
 
         SkMatrix offsetMatrix = origMatrix;
@@ skipping 51 matching lines @@
     SkAutoTUnref<SkPDFObject> image(
             SkPDFCreateImageObject(*bitmap, subset, fEncoder));
     if (!image) {
         return;
     }
 
     SkPDFUtils::DrawFormXObject(this->addXObjectResource(image.get()),
                                 &content.entry()->fContent);
 }