Merge "Camera: Skip AE precapture when possible" into klp-dev

        sp<Camera2Client> &client) {

    ATRACE_CALL();

    bool isAeConverged = false;

    // Get the onFrameAvailable callback when the requestID == mCaptureId

    client->registerFrameListener(mCaptureId, mCaptureId + 1,

            this);

    {

        Mutex::Autolock l(mInputMutex);

        isAeConverged = (mAEState == ANDROID_CONTROL_AE_STATE_CONVERGED);

    }

    {

        SharedParameters::Lock l(client->getParameters());

        // Skip AE precapture when it is already converged and not in force flash mode.

        if (l.mParameters.flashMode != Parameters::FLASH_MODE_ON && isAeConverged) {

            return STANDARD_CAPTURE;

        }

        mTriggerId = l.mParameters.precaptureTriggerCounter++;

    }

    client->getCameraDevice()->triggerPrecaptureMetering(mTriggerId);