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Some device's concept of time might be off.
To prevent corrupt texture runtime measurements from corrupting
the texture upload logic, we clamp the runtimes to the range
of [1,15000] microseconds.

If the corrupt runtimes are 0, this patch will effectively cause
us to always upload all pending textures.

This is a workaround until the async texture upload feature lands.

BUG=162699


Review URL: https://chromiumcodereview.appspot.com/11434111

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171108 0039d316-1c4b-4281-b951-d872f2087c98