[chromecast] Add bindings_manager_cast target for Android build

Previously, bindings_manager_cast target was guarded by is_linux. This
should be available for all non-fuchsia builds.

Bug: internal b/141398875
Test: CQ
Change-Id: I21d95c65040956dd4446eff61dbd50acbb3f4e20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815949Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Jiawei Li <lijiawei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699041}

chromecast/bindings/BUILD.gn

@@ -56,7 +56,7 @@ if (is_fuchsia) {
   }
 }
 
-if (is_linux) {
+if (is_linux || is_android) {
   source_set("bindings_manager_cast") {
     sources = [
       "bindings_manager_cast.cc",
@@ -111,7 +111,7 @@ if (is_linux) {
 source_set("browsertests") {
   testonly = true
   deps = []
-  if (is_linux) {
+  if (is_linux || is_android) {
     deps += [ "//chromecast/bindings:browsertests_cast" ]
   }
 }