Respect user preference to open mic on Assistant launch.

Previously a voice interaction was only started if in tablet mode. Now,
we'll also factor in user preference to start a voice interaction on
Assistant entry.

This CL is reliant on and cannot be submitted before:
https://chromium-review.googlesource.com/c/chromium/src/+/1244441

Bug: b:115843337
Change-Id: Ia50b992843e542027e26faa2b522f3d4d48aa58e
Reviewed-on: https://chromium-review.googlesource.com/1252631
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595633}

ash/assistant/assistant_interaction_controller.cc

@@ -162,13 +162,7 @@ void AssistantInteractionController::OnUiVisibilityChanged(
       model_.SetInputModality(InputModality::kKeyboard);
       break;
     case AssistantVisibility::kVisible:
-      if (source == AssistantSource::kLauncherSearchBox ||
-          source == AssistantSource::kLongPressLauncher) {
-        if (IsTabletMode())
-          StartVoiceInteraction();
-      } else if (source == AssistantSource::kStylus) {
-        model_.SetInputModality(InputModality::kStylus);
-      }
+      OnUiVisible(source);
       break;
   }
 }
@@ -451,6 +445,34 @@ void AssistantInteractionController::OnDialogPlateContentsCommitted(
   StartTextInteraction(text);
 }
 
+void AssistantInteractionController::OnUiVisible(AssistantSource source) {
+  DCHECK_EQ(AssistantVisibility::kVisible,
+            assistant_controller_->ui_controller()->model()->visibility());
+
+  switch (source) {
+    case AssistantSource::kHotkey:
+    case AssistantSource::kLauncherSearchBox:
+    case AssistantSource::kLongPressLauncher: {
+      // When the user prefers it or when we are in tablet mode, launching
+      // Assistant UI will immediately start a voice interaction.
+      const bool launch_with_mic_open =
+          Shell::Get()->voice_interaction_controller()->launch_with_mic_open();
+      if (launch_with_mic_open || IsTabletMode())
+        StartVoiceInteraction();
+      break;
+    }
+    case AssistantSource::kStylus:
+      model_.SetInputModality(InputModality::kStylus);
+      break;
+    case AssistantSource::kUnspecified:
+    case AssistantSource::kDeepLink:
+    case AssistantSource::kHotword:
+    case AssistantSource::kSetup:
+      // No action necessary.
+      break;
+  }
+}
+
 void AssistantInteractionController::StartMetalayerInteraction(
     const gfx::Rect& region) {
   StopActiveInteraction(false);

ash/assistant/assistant_interaction_controller.h

@@ -99,6 +99,8 @@ class AssistantInteractionController
   void OnSuggestionChipPressed(const AssistantSuggestion* suggestion);
 
  private:
+  void OnUiVisible(AssistantSource source);
+
   void StartMetalayerInteraction(const gfx::Rect& region);
   void StartScreenContextInteraction();
   void StartTextInteraction(const std::string text);