base: Add AsBinary() function to Value API.

base: Add AsBinary() function to Value API.

This function should simplify some constructions.

Instead of:

if (!value->IsType(Value::TYPE_BINARY))
  return false;
  BinaryValue* binary_value = static_cast<BinaryValue*>(value);

You can do:

BinaryValue* binary_value = value->AsBinary();
if (!binary_value)
  return false;

BUG=None
TEST=base_unittests --gtest_filter=Values*

R=evan@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=98266

[Evan Martin, 2011-08-25 15:18:36]

LGTM

http://codereview.chromium.org/7748017/diff/1001/base/values_unittest.cc
File base/values_unittest.cc (right):

http://codereview.chromium.org/7748017/diff/1001/base/values_unittest.cc#newc...
base/values_unittest.cc:425: original_binary->GetSize()));
new code is a lot better!