Revert of Remove setVoiceSearchSupported part of EmbeddedSearch SearchBox API.

chrome/browser/ui/search/search_model.cc

Index: chrome/browser/ui/search/search_model.cc
diff --git a/chrome/browser/ui/search/search_model.cc b/chrome/browser/ui/search/search_model.cc
index 57b83bd852d9be96f78665621bf6e5c720efe135..17d5a96d2c638d0eff20809498a78287ebb86ac4 100644
--- a/chrome/browser/ui/search/search_model.cc
+++ b/chrome/browser/ui/search/search_model.cc
@@ -7,14 +7,22 @@
 #include "chrome/browser/ui/search/search_model_observer.h"
 #include "components/search/search.h"
 
-SearchModel::State::State() : instant_support(INSTANT_SUPPORT_UNKNOWN) {}
+SearchModel::State::State()
+    : instant_support(INSTANT_SUPPORT_UNKNOWN),
+      voice_search_supported(false) {
+}
 
 SearchModel::State::State(const SearchMode& mode,
-                          InstantSupportState instant_support)
-    : mode(mode), instant_support(instant_support) {}
+                          InstantSupportState instant_support,
+                          bool voice_search_supported)
+    : mode(mode),
+      instant_support(instant_support),
+      voice_search_supported(voice_search_supported) {
+}
 
 bool SearchModel::State::operator==(const State& rhs) const {
-  return mode == rhs.mode && instant_support == rhs.instant_support;
+  return mode == rhs.mode && instant_support == rhs.instant_support &&
+      voice_search_supported == rhs.voice_search_supported;
 }
 
 SearchModel::SearchModel() {
@@ -67,6 +75,21 @@
                     ModelChanged(old_state, state_));
 }
 
+void SearchModel::SetVoiceSearchSupported(bool supported) {
+  DCHECK(search::IsInstantExtendedAPIEnabled())
+      << "Please do not try to set the SearchModel state without first "
+      << "checking if Search is enabled.";
+
+  if (state_.voice_search_supported == supported)
+    return;
+
+  const State old_state = state_;
+  state_.voice_search_supported = supported;
+
+  FOR_EACH_OBSERVER(SearchModelObserver, observers_,
+                    ModelChanged(old_state, state_));
+}
+
 void SearchModel::AddObserver(SearchModelObserver* observer) {
   observers_.AddObserver(observer);
 }