content: Not all memory creation failures are out of memory errors.

content/child/child_thread_impl.h

 // 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.
 
 #ifndef CONTENT_CHILD_CHILD_THREAD_IMPL_H_
 #define CONTENT_CHILD_CHILD_THREAD_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 85 matching lines @@
   IPC::MessageRouter* GetRouter();
 
   // Allocates a block of shared memory of the given size. Returns NULL on
   // failure.
   // Note: On posix, this requires a sync IPC to the browser process,
   // but on windows the child process directly allocates the block.
   std::unique_ptr<base::SharedMemory> AllocateSharedMemory(size_t buf_size);
 
   // A static variant that can be called on background threads provided
   // the |sender| passed in is safe to use on background threads.
+  // |out_of_memory| is an output variable populated on failure which tells the
+  // caller whether the failure was caused by an out of memory error.
   static std::unique_ptr<base::SharedMemory> AllocateSharedMemory(
       size_t buf_size,
-      IPC::Sender* sender);
+      IPC::Sender* sender,
+      bool* out_of_memory);
 
   ChildSharedBitmapManager* shared_bitmap_manager() const {
     return shared_bitmap_manager_.get();
   }
 
   ChildGpuMemoryBufferManager* gpu_memory_buffer_manager() const {
     return gpu_memory_buffer_manager_.get();
   }
 
   ChildDiscardableSharedMemoryManager* discardable_shared_memory_manager()
@@ skipping 204 matching lines @@
 
  private:
   struct Options options_;
 
   DISALLOW_COPY_AND_ASSIGN(Builder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_CHILD_THREAD_IMPL_H_