Enable platform echo cancellation through the AudioRecord path.

media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java

Index: media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
diff --git a/media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java b/media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
index 0c37c0a9e3a51c92e52e907ba449fcc76cd7019b..cd21265f83d0e0e03962b56e3fe7bb2dcd73dc00 100644
--- a/media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
+++ b/media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
@@ -13,6 +13,7 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.pm.PackageManager;
 import android.database.ContentObserver;
+import android.media.audiofx.AcousticEchoCanceler;
 import android.media.AudioFormat;
 import android.media.AudioManager;
 import android.media.AudioRecord;
@@ -314,7 +315,7 @@ class AudioManagerAndroid {
 
     @CalledByNative
     private int getNativeOutputSampleRate() {
-        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
             String sampleRateString = mAudioManager.getProperty(
                     AudioManager.PROPERTY_OUTPUT_SAMPLE_RATE);
             return (sampleRateString == null ?
@@ -378,6 +379,17 @@ class AudioManagerAndroid {
                 DEFAULT_FRAME_PER_BUFFER : Integer.parseInt(framesPerBuffer));
     }
 
+    @CalledByNative
+    public static boolean shouldUseAcousticEchoCanceler() {
+        // AcousticEchoCanceler was added in API level 16 (Jelly Bean).
+        // Next is a list of device models which have been vetted for good
+        // quality platform echo cancellation.
+        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN &&
+               AcousticEchoCanceler.isAvailable() &&
+               (Build.MODEL.equals("Nexus 5") ||
+                Build.MODEL.equals("Nexus 7"));
+    }
+
     /** Sets the speaker phone mode. */
     public void setSpeakerphoneOn(boolean on) {
         boolean wasOn = mAudioManager.isSpeakerphoneOn();
@@ -603,12 +615,12 @@ class AudioManagerAndroid {
     }
 
     /** Trivial helper method for debug logging */
-    private void logd(String msg) {
+    private static void logd(String msg) {
         Log.d(TAG, msg);
     }
 
     /** Trivial helper method for error logging */
-    private void loge(String msg) {
+    private static void loge(String msg) {
         Log.e(TAG, msg);
     }