add installPixels

src/utils/mac/SkCreateCGImageRef.cpp

Index: src/utils/mac/SkCreateCGImageRef.cpp
diff --git a/src/utils/mac/SkCreateCGImageRef.cpp b/src/utils/mac/SkCreateCGImageRef.cpp
index 0677b7bc304399b4aa6ffebd56992d16c99252fd..1b52ba31a695300f63933426d8f0187e40a9c8b6 100644
--- a/src/utils/mac/SkCreateCGImageRef.cpp
+++ b/src/utils/mac/SkCreateCGImageRef.cpp
@@ -209,8 +209,9 @@ bool SkPDFDocumentToBitmap(SkStream* stream, SkBitmap* output) {
     int h = (int)CGRectGetHeight(bounds);
 
     SkBitmap bitmap;
-    bitmap.setConfig(SkBitmap::kARGB_8888_Config, w, h);
-    bitmap.allocPixels();
+    if (!bitmap.allocPixels(SkImageInfo::MakeN32Premul(w, h))) {
+        return false;
+    }
     bitmap.eraseColor(SK_ColorWHITE);
 
     size_t bitsPerComponent;