Add Andtroid Q gate to wide color gamut

Right now, we first check if the user is in the enabled feature group when
enabling wide color gamut. After that, we check if they are on a version
of Android that supports wide color gamut. This results in users in the
enabled group who aren't actually seeing wide colors.

This CL checks if the user is on a supported version of Android before
checking which group they are in. That should give us more accurate
results when looking at the effect of the experiment.

Bug: 1136572
Change-Id: Ied060b1036bba67a0c90a45f1f8e1dc106af4aea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462218
Commit-Queue: Chris Blume <cblume@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815324}

components/viz/common/features.cc

@@ -121,6 +121,9 @@ bool IsUsingSkiaRenderer() {
 bool IsDynamicColorGamutEnabled() {
   if (viz::AlwaysUseWideColorGamut())
     return false;
+  auto* build_info = base::android::BuildInfo::GetInstance();
+  if (!build_info->is_at_least_q())
+    return false;
   return base::FeatureList::IsEnabled(kDynamicColorGamut);
 }
 #endif