Standardize "gpu_times" metric names and add GPU rasterization versions.
Standardize "gpu_times" metric names and add GPU rasterization versions.

The GPU Times metric event names have been standardized to match the
names for other metrics. GPU Rasterization versions have also been
added for both GPU times tests. Here is the list of test names:
  gpu_times.gpu_rasterization.key_mobile_sites_smooth
  gpu_times.gpu_rasterization.top_25_smooth
  gpu_times.key_mobile_sites_smooth
  gpu_times.top_25_smooth

R=vmiura@chromium.org
BUG=none
test=trybots

Review URL: https://codereview.chromium.org/875473003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#313825}

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