Add a new constant to ui/base/ime/chromeos/ for Android IMEs

Android IMEs installed to Chrome OS will be associated with a
special Chrome OS language name. This CL adds the fake language.

BUG=b:74499980
TEST=ui_base_unittests

Change-Id: If5f78cc22c8371ef6199b67563792bc008aaeab2
Reviewed-on: https://chromium-review.googlesource.com/1113205Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569989}

ui/base/ime/chromeos/extension_ime_util.cc

@@ -31,6 +31,8 @@ const char kBrailleImeExtensionPath[] = "chromeos/braille_ime";
 const char kBrailleImeEngineId[] =
     "_comp_ime_jddehjeebkoimngcbdkaahpobgicbffpbraille";
 
+const char kArcImeLanguage[] = "_arc_ime_language_";
+
 std::string GetInputMethodID(const std::string& extension_id,
                              const std::string& engine_id) {
   DCHECK(!extension_id.empty());
@@ -150,6 +152,10 @@ bool IsKeyboardLayoutExtension(const std::string& input_method_id) {
   return false;
 }
 
+bool IsLanguageForArcIME(const std::string& language) {
+  return language == kArcImeLanguage;
+}
+
 std::string MaybeGetLegacyXkbId(const std::string& input_method_id) {
   if (IsKeyboardLayoutExtension(input_method_id))
     return GetComponentIDByInputMethodID(input_method_id);

ui/base/ime/chromeos/extension_ime_util.h

@@ -41,6 +41,9 @@ UI_BASE_IME_EXPORT extern const char kBrailleImeExtensionId[];
 UI_BASE_IME_EXPORT extern const char kBrailleImeExtensionPath[];
 UI_BASE_IME_EXPORT extern const char kBrailleImeEngineId[];
 
+// The fake language name used for ARC IMEs.
+UI_BASE_IME_EXPORT extern const char kArcImeLanguage[];
+
 // Returns InputMethodID for |engine_id| in |extension_id| of extension IME.
 // This function does not check |extension_id| is installed extension IME nor
 // |engine_id| is really a member of |extension_id|.
@@ -98,6 +101,9 @@ bool UI_BASE_IME_EXPORT IsMemberOfExtension(const std::string& input_method_id,
 bool UI_BASE_IME_EXPORT
 IsKeyboardLayoutExtension(const std::string& input_method_id);
 
+// Returns true if |language| is the fake one for ARC IMEs.
+bool UI_BASE_IME_EXPORT IsLanguageForArcIME(const std::string& language);
+
 // Returns input method component id from the extension-based InputMethodID
 // for component IME extensions. This function does not check that
 // |input_method_id| is installed.

ui/base/ime/chromeos/extension_ime_util_unittest.cc

@@ -109,4 +109,11 @@ TEST(ExtensionIMEUtilTest, IsMemberOfExtension) {
                                                        extention3));
 }
 
+TEST(ExtensionIMEUtilTest, IsLanguageForArcIMETest) {
+  EXPECT_TRUE(extension_ime_util::IsLanguageForArcIME(
+      extension_ime_util::kArcImeLanguage));
+  EXPECT_FALSE(extension_ime_util::IsLanguageForArcIME(
+      extension_ime_util::kArcImeLanguage + std::string(" ")));
+}
+
 }  // namespace chromeos