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It is convenient for debugging.

Although console.log() is supported by chrome directly, mojo bindings currently are loaded using gin. Therefore, console.log() is not always available and needs to be defined as a module. After we move away from gin/AMD, we should be able to get rid of this.

BUG=579646
TBR=jochen@chromium.org
(deferring to eugenebut)

Review-Url: https://codereview.chromium.org/2618693004
Cr-Commit-Position: refs/heads/master@{#442972}