Add D3DCompile timer histogram to dashboard.
Add D3DCompile timer histogram to dashboard.

This histogram tracks the time we spend compiling shaders on
Windows, at the inner-most scope possible.

BUG=516027

Review URL: https://codereview.chromium.org/1263123003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#341727}

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