Add additional flag to control Japanese IME.

Change-Id: Iaa7137065146970f40d6c29ca27ad866424bd6fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2054124
Commit-Queue: Yingbing Wu <wuyingbing@chromium.org>
Reviewed-by: David Vallet <dvallet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741384}

chrome/browser/about_flags.cc

@@ -2619,6 +2619,9 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kImeInputLogicHmmName,
      flag_descriptions::kImeInputLogicHmmDescription, kOsCrOS,
      FEATURE_VALUE_TYPE(chromeos::features::kImeInputLogicHmm)},
+    {"enable-cros-ime-mozc-proto", flag_descriptions::kImeMozcProtoName,
+     flag_descriptions::kImeMozcProtoDescription, kOsCrOS,
+     FEATURE_VALUE_TYPE(chromeos::features::kImeMozcProto)},
     {"enable-cros-ime-native-decoder", flag_descriptions::kImeNativeDecoderName,
      flag_descriptions::kImeNativeDecoderDescription, kOsCrOS,
      FEATURE_VALUE_TYPE(chromeos::features::kImeDecoderWithSandbox)},

chrome/browser/flag-metadata.json

@@ -1191,6 +1191,11 @@
     "owners": [ "essential-inputs-team@google.com" ],
     "expiry_milestone": 85
   },
+  {
+    "name": "enable-cros-ime-mozc-proto",
+    "owners": [ "essential-inputs-team@google.com" ],
+    "expiry_milestone": 85
+  },
   {
     "name": "enable-cros-ime-native-decoder",
     "owners": [ "essential-inputs-team@google.com" ],

chrome/browser/flag_descriptions.cc

@@ -3454,6 +3454,11 @@ const char kImeInputLogicHmmName[] = "Enable HMM Input Logic on IME";
 const char kImeInputLogicHmmDescription[] =
     "Enable HMM Input Logic to replace the IME legacy input logic on NaCl";
 
+const char kImeMozcProtoName[] = "Enable protobuf on Japanese IME";
+const char kImeMozcProtoDescription[] =
+    "Enable Japanese IME to use protobuf as interactive message format to "
+    "replace JSON";
+
 const char kImeNativeDecoderName[] = "Enable native decoders in IME Service";
 const char kImeNativeDecoderDescription[] =
     "Enable native decoders in IME service to deprecate NaCl decoders";

chrome/browser/flag_descriptions.h

@@ -2011,6 +2011,9 @@ extern const char kImeInputLogicFstDescription[];
 extern const char kImeInputLogicHmmName[];
 extern const char kImeInputLogicHmmDescription[];
 
+extern const char kImeMozcProtoName[];
+extern const char kImeMozcProtoDescription[];
+
 extern const char kImeNativeDecoderName[];
 extern const char kImeNativeDecoderDescription[];
 

tools/metrics/histograms/enums.xml

@@ -37514,10 +37514,12 @@ from previous Chrome versions.
   <int value="-1391728260" label="ContextualSearchDefinitions:enabled"/>
   <int value="-1391693054"
       label="ContentSuggestionsFaviconsFromNewServer:disabled"/>
+  <int value="-1391645613" label="ImeMozcProto:enabled"/>
   <int value="-1390331361"
       label="SyncPseudoUSSHistoryDeleteDirectives:enabled"/>
   <int value="-1388817073" label="OmniboxReverseAnswers:disabled"/>
   <int value="-1386966873" label="disable-mac-views-native-app-windows"/>
+  <int value="-1386790338" label="ImeMozcProto:disabled"/>
   <int value="-1385221197"
       label="AllowSignedHTTPExchangeCertsWithoutExtension:enabled"/>
   <int value="-1384426209" label="SharingDeviceRegistration:disabled"/>