Introduce build config for touchless media controls.

Bug: 942577
Change-Id: I61985da174bda2dd1dfa35b971b7738b7aaaeef6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1543452
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#645342}

third_party/blink/renderer/modules/BUILD.gn

@@ -31,6 +31,10 @@ config("modules_implementation") {
   defines = [ "BLINK_MODULES_IMPLEMENTATION=1" ]
 }
 
+config("notouch_config") {
+  defines = [ "TOUCHLESS_MEDIA_CONTROLS" ]
+}
+
 make_names("module_names") {
   in_files = [ "indexeddb/indexed_db_names.json5" ]
   output_dir = blink_modules_output_dir
@@ -181,6 +185,10 @@ target("jumbo_" + modules_target_type, "modules") {
 
   configs -= [ "//build/config/compiler:default_symbols" ]
   configs += blink_symbols_config
+
+  if (is_android && notouch_build) {
+    configs += [ ":notouch_config" ]
+  }
 }
 
 jumbo_source_set("modules_testing") {

third_party/blink/renderer/modules/modules_initializer.cc

@@ -94,6 +94,10 @@
 #include "third_party/blink/renderer/platform/wtf/functional.h"
 #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
 
+#if defined(TOUCHLESS_MEDIA_CONTROLS)
+#include "third_party/blink/renderer/modules/media_controls/touchless/media_controls_touchless_impl.h"
+#endif
+
 namespace blink {
 
 void ModulesInitializer::Initialize() {
@@ -203,7 +207,11 @@ void ModulesInitializer::ProvideIndexedDBClientToWorker(
 MediaControls* ModulesInitializer::CreateMediaControls(
     HTMLMediaElement& media_element,
     ShadowRoot& shadow_root) const {
+#if defined(TOUCHLESS_MEDIA_CONTROLS)
+  return MediaControlsTouchlessImpl::Create(media_element, shadow_root);
+#else
   return MediaControlsImpl::Create(media_element, shadow_root);
+#endif
 }
 
 PictureInPictureController*