Change kMaxCountOfMoreGpuThreadTimeAllowed of the GPU watchdog to 3

Bug: 949839
Change-Id: I86f724255250bf7219c2c81bdc80dcc31f343d3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2226315Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774332}

gpu/ipc/service/gpu_watchdog_thread_v2.h

@@ -13,7 +13,7 @@ namespace gpu {
 // If the actual time the watched GPU thread spent doing actual work is less
 // than the wathdog timeout, the GPU thread can continue running through
 // OnGPUWatchdogTimeout for at most 4 times before the gpu thread is killed.
-constexpr int kMaxCountOfMoreGpuThreadTimeAllowed = 4;
+constexpr int kMaxCountOfMoreGpuThreadTimeAllowed = 3;
 #endif
 constexpr int kMaxExtraCyclesBeforeKill = 0;