DCHECK affects performance in release build. OFFICIAL_BUILD is okay, but this ifdef makes DCHECK only work in debug. On 720p DCHECK version is 8.14 ms and without, its 2.68 ms
DCHECK affects performance in release build.
OFFICIAL_BUILD is okay, but this ifdef makes DCHECK only work in debug.
On 720p DCHECK version is 8.14 ms and without, its 2.68 ms

Review URL: http://codereview.chromium.org/40245

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@11191 0039d316-1c4b-4281-b951-d872f2087c98

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