Mac: clang build

gpu/command_buffer/client/fenced_allocator.h

 // Copyright (c) 2009 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.
 
 // This file contains the definition of the FencedAllocator class.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_
 #define GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_
 
 #include <vector>
@@ skipping 194 matching lines @@
   // Gets a pointer to a memory block given the base memory and the offset.
   // It translates FencedAllocator::kInvalidOffset to NULL.
   void *GetPointer(FencedAllocator::Offset offset) {
     return (offset == FencedAllocator::kInvalidOffset) ?
         NULL : static_cast<char *>(base_) + offset;
   }
 
   // Gets the offset to a memory block given the base memory and the address.
   // It translates NULL to FencedAllocator::kInvalidOffset.
   FencedAllocator::Offset GetOffset(void *pointer) {
-    return pointer ? static_cast<char *>(pointer) - static_cast<char *>(base_) :
+    return pointer ?
+        static_cast<FencedAllocator::Offset>(
+            static_cast<char*>(pointer) - static_cast<char*>(base_)) :
         FencedAllocator::kInvalidOffset;
   }
 
   // Gets the size of the largest free block that is available without waiting.
   unsigned int GetLargestFreeSize() {
     return allocator_.GetLargestFreeSize();
   }
 
   // Gets the size of the largest free block that can be allocated if the
   // caller can wait.
@@ skipping 11 matching lines @@
 
  private:
   FencedAllocator allocator_;
   void* base_;
   DISALLOW_IMPLICIT_CONSTRUCTORS(FencedAllocatorWrapper);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_FENCED_ALLOCATOR_H_