BackForwardCache: unblocklist geolocation API on Android

The API was previously blocklisted due to:
- test failures, which was resolved in [1]
- omnibox geolocation icon incompat, which is not available on Android

This CL unblocklists geolocation API on Android.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/1883428

Bug: 1015377, 989847
Change-Id: I1ee2dd4f9c9496622769431040fd0d99440ad0b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886534
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Reviewed-by: Fergal Daly <fergal@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712922}

content/browser/frame_host/back_forward_cache_impl.cc

@@ -8,6 +8,8 @@
 #include <string>
 
 #include "base/metrics/field_trial_params.h"
+#include "base/strings/string_split.h"
+#include "build/build_config.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/render_frame_host_delegate.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
@@ -78,7 +80,15 @@ bool IsServiceWorkerSupported() {
 
 bool IsGeolocationSupported() {
   static constexpr base::FeatureParam<bool> geolocation_supported(
-      &features::kBackForwardCache, "geolocation_supported", false);
+      &features::kBackForwardCache, "geolocation_supported",
+#if defined(OS_ANDROID)
+      true
+#else
+      // TODO(crbug.com/989847): Omnibox icon should be updated when the page
+      //                         enters or is restored from BackForwardCache.
+      false
+#endif
+  );
   return geolocation_supported.Get();
 }