Telemetry: Fix typo for non-Android GPU thread name.

GPU->Gpu

TBR=nduca@chromium.org
BUG=PEBKAC
NOTRY=true

No-try since it's a three character change and breaking the test on the mac.

Review URL: https://codereview.chromium.org/141373003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245400 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf/metrics/timeline.py

@@ -121,7 +121,7 @@ class LoadTimesTimelineMetric(TimelineMetric):
 # for simplicity.
 TimelineThreadCategories =  {
   "Chrome_InProcGpuThread": "GPU",
-  "CrGPUMain"             : "GPU",
+  "CrGpuMain"             : "GPU",
   "AsyncTransferThread"   : "GPU_transfer",
   "CrBrowserMain"         : "browser_main",
   "Browser Compositor"    : "browser_compositor",