[MediaStream] Support new EchoCancellationModes in track capabilities

Bug: 428856440
Change-Id: I4a67a857d1426da1e6a44d72c4d4ad0d72327072
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6779826
Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1492188}

Author: Guido Urdaneta

mediacapture-streams/MediaStreamTrack-getCapabilities.https.html

@@ -10,7 +10,7 @@
 const audioProperties = [
   {name: "sampleRate", type: "number"},
   {name: "sampleSize", type: "number"},
-  {name: "echoCancellation", type: "boolean"},
+  {name: "echoCancellation", type: "boolean or string", validValues: [true, false, "all", "remote-only"]},
   {name: "autoGainControl", type: "boolean"},
   {name: "noiseSuppression", type: "boolean"},
   {name: "voiceIsolation", type: "boolean"},
@@ -62,6 +62,13 @@
   });
 }
 
+function verifyBooleanOrStringCapability(capability, validMembers) {
+  capability.forEach(c => {
+    assert_true(typeof c == "boolean" || typeof c == "string");
+    assert_in_array(c, validMembers);
+  });
+}
+
 function testCapabilities(capabilities, property, testNamePrefix) {
   let testName = testNamePrefix + " " + property.name;
   test(() => {
@@ -82,6 +89,12 @@
     }, testName);
   }
 
+  if (property.type == "boolean or string") {
+    test(() => {
+      verifyBooleanOrStringCapability(capability, property.validValues);
+    }, testName);
+  }
+
   if (property.type == "number") {
     test(() => {
       verifyNumberCapability(capability);