[Fuchsia] Enable GPU rasterization by default

Now DefaultEnableGpuRasterization is enabled by default on Fuchsia. It
doesn't have any effect yet, until we enable Vulkan and OOP-R.

Bug: 962617
Change-Id: Ieebc9ba8976e66123a26d76980924cb1ec86f843
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610220
Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659332}

gpu/config/gpu_finch_features.cc

@@ -43,7 +43,7 @@ const base::Feature kAndroidSurfaceControl{"AndroidSurfaceControl",
 // Enable GPU Rasterization by default. This can still be overridden by
 // --force-gpu-rasterization or --disable-gpu-rasterization.
 #if defined(OS_MACOSX) || defined(OS_WIN) || defined(OS_CHROMEOS) || \
-    defined(OS_ANDROID)
+    defined(OS_ANDROID) || defined(OS_FUCHSIA)
 // DefaultEnableGpuRasterization has launched on Mac, Windows, ChromeOS, and
 // Android.
 const base::Feature kDefaultEnableGpuRasterization{