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recognition service is ready.

As soon as a user presses play on a video or audio, the caption bubble
should appear with the text "Detecting speech...". To do this, this CL
introduces an OnSpeechRecognitionReady function to the CaptionHost mojo
interface, which is called the first time the
ChromeSpeechRecognitionClient receives audio to be sent to the speech
service. The ChromeSpeechRecognitionClient is constructed when the
media is first constructed, which is why this is called when audio is
received rather than when the recognizer is bound (which is when the
on_ready_callback is called back to the renderer).

The flow of information from the speech recognition service to the UI
is as follows:

ChromeSpeechRecognitionClient::SendAudioToSpeechRecognitionService()
-----chrome::mojom::CaptionHost OnSpeechRecognitionReady-----
CaptionHostImpl::OnSpeechRecognitionReady()
CaptionController::OnSpeechRecognitionReady(
      content::WebContents* web_contents)
CaptionBubbleControllerViews::OnSpeechRecognitionReady()
CaptionBubbleModel::OnReady()

Bug: 1055150
Change-Id: Ib5eff4034b236b1ee1c6747628b11f9f21506460
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321406Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: Katie Dektar <katie@chromium.org>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#793684}