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When the microphone volume is low, the pre-processed audio data contains energy, while the post-processed audio data has only 0, we report 0 as energy before this patch, which is wrong since the audio flow contains energy.

This patch fix the problem by checking the energy of pre-processed data before reporting 0 as energy.

BUG=424149
TEST=1, use a USB headset.
2, set the microphone volume low, like below 50%.
3, join a hangout call.
4, open chrome://webrtc-internals, and look at the energy of input stream, constantly it is 0 there.

Review URL: https://codereview.chromium.org/661693003

Cr-Commit-Position: refs/heads/master@{#300274}