[VK] Expose enable-virtual-keyboard-md-ui flag value to the keyboard...

[VK] Expose enable-virtual-keyboard-md-ui flag value to the keyboard configuration of  API "chrome.virtualKeyboardPrivate.getConfig".

Change-Id: I7c8832c8d7a259774a2377eab60227f93b291c0a
Reviewed-on: https://chromium-review.googlesource.com/1103421Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Yingbing Wu <wuyingbing@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567928}

chrome/browser/extensions/api/virtual_keyboard_private/chrome_virtual_keyboard_delegate.cc

@@ -268,6 +268,8 @@ void ChromeVirtualKeyboardDelegate::OnHasInputDevices(
   features->AppendString(GenerateFeatureFlag(
       "fullscreenhandwriting",
       keyboard::IsFullscreenHandwritingVirtualKeyboardEnabled()));
+  features->AppendString(GenerateFeatureFlag(
+      "virtualkeyboardmdui", keyboard::IsVirtualKeyboardMdUiEnabled()));
 
   const keyboard::KeyboardConfig config = keyboard::GetKeyboardConfig();
   // TODO(oka): Change this to use config.voice_input.

ui/keyboard/keyboard_switches.h

@@ -33,6 +33,9 @@ KEYBOARD_EXPORT extern const char kEnableVirtualKeyboard[];
 // Floating virtual keyboard flag.
 KEYBOARD_EXPORT extern const char kEnableFloatingVirtualKeyboard[];
 
+// Virtual keyboard material design UI flag.
+KEYBOARD_EXPORT extern const char kEnableVirtualKeyboardMdUi[];
+
 // Disabled overscrolling of web content when the virtual keyboard is displayed.
 // If disabled, the work area is resized to restrict windows from overlapping
 // with the keybaord area.

ui/keyboard/keyboard_util.cc

@@ -203,6 +203,10 @@ bool IsStylusVirtualKeyboardEnabled() {
   return base::FeatureList::IsEnabled(features::kEnableStylusVirtualKeyboard);
 }
 
+bool IsVirtualKeyboardMdUiEnabled() {
+  return base::FeatureList::IsEnabled(features::kEnableVirtualKeyboardMdUi);
+}
+
 bool IsGestureTypingEnabled() {
   return !base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kDisableGestureTyping);

ui/keyboard/keyboard_util.h

@@ -142,6 +142,9 @@ KEYBOARD_EXPORT bool IsFullscreenHandwritingVirtualKeyboardEnabled();
 // Returns true if stylus virtual keyboard feature is enabled.
 KEYBOARD_EXPORT bool IsStylusVirtualKeyboardEnabled();
 
+// Returns true if virtual keyboard md ui feature is enabled.
+KEYBOARD_EXPORT bool IsVirtualKeyboardMdUiEnabled();
+
 // Returns true if gesture typing option is enabled for virtual keyboard.
 KEYBOARD_EXPORT bool IsGestureTypingEnabled();