Each benchmark that needs a bitmap will now make its own.
Each benchmark that needs a bitmap will now make its own.

Before, the bitmaps were created and then passed to the benchmark. However, some benchmarks in the future will not require bitmaps. This will remove the necessity of passing around an extraneous bitmap to those tests.

Review URL: https://codereview.appspot.com/6356081

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@4519 2bbb7eff-a529-9590-31e7-b0007b416f81

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