Adds support for OpenSL ES based audio capture on Android

webrtc/modules/audio_device/android/audio_device_template.h

Index: webrtc/modules/audio_device/android/audio_device_template.h
diff --git a/webrtc/modules/audio_device/android/audio_device_template.h b/webrtc/modules/audio_device/android/audio_device_template.h
index 40e15ca357cb6dbcc351de936e47962bb01a9a38..9f12e181979f8e46250a799b81cd4f1088e68e60 100644
--- a/webrtc/modules/audio_device/android/audio_device_template.h
+++ b/webrtc/modules/audio_device/android/audio_device_template.h
@@ -485,11 +485,22 @@ class AudioDeviceTemplate : public AudioDeviceGeneric {
 
   // Returns true if the device both supports built in AEC and the device
   // is not blacklisted.
+  // Currently, if OpenSL ES is used in both directions, this method will still
+  // report the correct value and it has the correct effect. As an example:
+  // a device supports built in AEC and this method returns true. Libjingle
+  // will then disable the WebRTC based AEC and that will work for all devices
+  // (mainly Nexus) even when OpenSL ES is used for input since our current
+  // implementation will enable built-in AEC by default also for OpenSL ES.
+  // The only "bad" thing that happens today is that when Libjingle calls
+  // OpenSLESRecorder::EnableBuiltInAEC() it will not have any real effect and
+  // a "Not Implemented" log will be filed. This non-perfect state will remain
+  // until I have added full support for audio effects based on OpenSL ES APIs.
   bool BuiltInAECIsAvailable() const override {
     LOG(INFO) << __FUNCTION__;
     return audio_manager_->IsAcousticEchoCancelerSupported();
   }
 
+  // TODO(henrika): add implementation for OpenSL ES based audio as well.
   int32_t EnableBuiltInAEC(bool enable) override {
     LOG(INFO) << __FUNCTION__ << "(" << enable << ")";
     RTC_CHECK(BuiltInAECIsAvailable()) << "HW AEC is not available";
@@ -498,11 +509,14 @@ class AudioDeviceTemplate : public AudioDeviceGeneric {
 
   // Returns true if the device both supports built in AGC and the device
   // is not blacklisted.
+  // TODO(henrika): add implementation for OpenSL ES based audio as well.
+  // In addition, see comments for BuiltInAECIsAvailable().
   bool BuiltInAGCIsAvailable() const override {
     LOG(INFO) << __FUNCTION__;
     return audio_manager_->IsAutomaticGainControlSupported();
   }
 
+  // TODO(henrika): add implementation for OpenSL ES based audio as well.
   int32_t EnableBuiltInAGC(bool enable) override {
     LOG(INFO) << __FUNCTION__ << "(" << enable << ")";
     RTC_CHECK(BuiltInAGCIsAvailable()) << "HW AGC is not available";
@@ -511,11 +525,14 @@ class AudioDeviceTemplate : public AudioDeviceGeneric {
 
   // Returns true if the device both supports built in NS and the device
   // is not blacklisted.
+  // TODO(henrika): add implementation for OpenSL ES based audio as well.
+  // In addition, see comments for BuiltInAECIsAvailable().
   bool BuiltInNSIsAvailable() const override {
     LOG(INFO) << __FUNCTION__;
     return audio_manager_->IsNoiseSuppressorSupported();
   }
 
+  // TODO(henrika): add implementation for OpenSL ES based audio as well.
   int32_t EnableBuiltInNS(bool enable) override {
     LOG(INFO) << __FUNCTION__ << "(" << enable << ")";
     RTC_CHECK(BuiltInNSIsAvailable()) << "HW NS is not available";