assisant: add aec flags

Bug: None
Test: flags unittests
Change-Id: I38ca60403e7ee50291a6685b1ab1c0e54e07d25f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829246Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700916}

chrome/browser/about_flags.cc

@@ -4637,6 +4637,12 @@ const FeatureEntry kFeatureEntries[] = {
      FEATURE_VALUE_TYPE(features::kLegacyTLSWarnings)},
 #endif
 
+#if defined(OS_CHROMEOS)
+    {"enable-assistant-aec", flag_descriptions::kEnableGoogleAssistantAecName,
+     flag_descriptions::kEnableGoogleAssistantAecDescription, kOsCrOS,
+     FEATURE_VALUE_TYPE(chromeos::assistant::features::kAssistantAudioEraser)},
+#endif
+
     // NOTE: Adding a new flag requires adding a corresponding entry to enum
     // "LoginCustomFlags" in tools/metrics/histograms/enums.xml. See "Flag
     // Histograms" in tools/metrics/histograms/README.md (run the

chrome/browser/flag-metadata.json

@@ -893,6 +893,11 @@
     "owners": [ "beccahughes", "media-dev" ],
     "expiry_milestone": 76
   },
+  {
+    "name": "enable-assistant-aec",
+    "owners": [ "croissant-eng" ],
+    "expiry_milestone": 88
+  },
   {
     "name": "enable-assistant-app-support",
     "owners": [ "croissant-eng" ],

chrome/browser/flag_descriptions.cc

@@ -3384,6 +3384,11 @@ const char kEnableGoogleAssistantStereoInputDescription[] =
     "Enable an experimental feature that uses stereo audio input for hotword "
     "and voice to text detection in Google Assistant.";
 
+const char kEnableGoogleAssistantAecName[] = "Enable Google Assistant AEC";
+const char kEnableGoogleAssistantAecDescription[] =
+    "Enable an experimental feature that removes local feedback from audio "
+    "input to help hotword and ASR when background audio is playing.";
+
 const char kEnableHeuristicStylusPalmRejectionName[] =
     "Enable Heuristic for Stylus/Palm Rejection.";
 const char kEnableHeuristicStylusPalmRejectionDescription[] =

chrome/browser/flag_descriptions.h

@@ -2010,6 +2010,9 @@ extern const char kEnableGoogleAssistantDspDescription[];
 extern const char kEnableGoogleAssistantStereoInputName[];
 extern const char kEnableGoogleAssistantStereoInputDescription[];
 
+extern const char kEnableGoogleAssistantAecName[];
+extern const char kEnableGoogleAssistantAecDescription[];
+
 extern const char kEnableHeuristicStylusPalmRejectionName[];
 extern const char kEnableHeuristicStylusPalmRejectionDescription[];
 

tools/metrics/histograms/enums.xml

@@ -36265,6 +36265,7 @@ from previous Chrome versions.
   <int value="-240531943" label="ContextualSearchRankerQuery:disabled"/>
   <int value="-239616243" label="HighDynamicRange:enabled"/>
   <int value="-239176328" label="BluetoothAggressiveAppearanceFilter:enabled"/>
+  <int value="-237367320" label="AssistantAudioEraser:disabled"/>
   <int value="-234966279" label="PointerEvent:disabled"/>
   <int value="-234687894"
       label="NonValidatingReloadOnRefreshContentV2:disabled"/>
@@ -37293,6 +37294,7 @@ from previous Chrome versions.
   <int value="1183431946" label="v8-cache-options"/>
   <int value="1184225265" label="AllowSyncXHRInPageDismissal:enabled"/>
   <int value="1185424279" label="enable-media-router"/>
+  <int value="1188109510" label="AssistantAudioEraser:enabled"/>
   <int value="1190035852" label="MediaRemoting:enabled"/>
   <int value="1192302892" label="gesture-typing"/>
   <int value="1192913630" label="OfflinePagesBackgroundLoading:disabled"/>