Allow creating SharedBitmaps backed by new[]

cc/resources/shared_bitmap.cc

 // Copyright 2013 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 "cc/resources/shared_bitmap.h"
 
 #include "base/logging.h"
 #include "base/numerics/safe_math.h"
 #include "base/rand_util.h"
 
 namespace cc {
 
 SharedBitmap::SharedBitmap(
     base::SharedMemory* memory,
     const SharedBitmapId& id,
     const base::Callback<void(SharedBitmap* bitmap)>& free_callback)
-    : memory_(memory), id_(id), free_callback_(free_callback) {}
+    : memory_(memory),
+      pixels_(static_cast<uint8*>(memory_->memory())),
+      id_(id),
+      free_callback_(free_callback) {
+}
+
+SharedBitmap::SharedBitmap(
+    uint8* pixels,
+    const SharedBitmapId& id,
+    const base::Callback<void(SharedBitmap* bitmap)>& free_callback)
+    : memory_(NULL), pixels_(pixels), id_(id), free_callback_(free_callback) {
+}
 
 SharedBitmap::~SharedBitmap() { free_callback_.Run(this); }
 
 // static
 bool SharedBitmap::SizeInBytes(const gfx::Size& size, size_t* size_in_bytes) {
   if (size.IsEmpty())
     return false;
   base::CheckedNumeric<size_t> s = 4;
   s *= size.width();
   s *= size.height();
@@ skipping 33 matching lines @@
 
 // static
 SharedBitmapId SharedBitmap::GenerateId() {
   SharedBitmapId id;
   // Needs cryptographically-secure random numbers.
   base::RandBytes(id.name, sizeof(id.name));
   return id;
 }
 
 }  // namespace cc