Introduce "disable-speech-api" content flag and add it to WebView.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 43c7174f4f2c6b789948167f3819c9159a082de2..d0bd75c66231e9bbd2db72689e6d309982ece78d 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -239,6 +239,9 @@ const char kDisableSmoothScrolling[]        = "disable-smooth-scrolling";
 // Disables the use of a 3D software rasterizer.
 const char kDisableSoftwareRasterizer[]     = "disable-software-rasterizer";
 
+// Disables the Web Speech API.

[Peter Beverloo, 2015/05/07 16:45:24]

The Web Speech API defines both speech recognition and speech synthesis:
  https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html

Your patches only disable speech recognition, which the command line flag name
accurately indicates, however, this comment does not.

What about "Disables the speech recognition part of the Web Speech API."?

On a tangent, does WebView expose window.speechSynthesis? Does that work? If it
doesn't, you may want to change your patches to encapsulate both speech
recognition and synthesis.

[timvolodine, 2015/05/07 18:45:14]

right, I've tested the speechSynthesis on webview and it doesn't appear to work
there (synthesizer is null so "speak" for example is never called), so I've
amended the blink patch to also disable synthesis for webview (behind the same
runtime blink switch).

So with this change the comment remains valid, and I've also renamed the flag to
"disable-speech".

+const char kDisableSpeechRecognition[]       = "disable-speech-recognition";

[Peter Beverloo, 2015/05/07 16:45:24]

micro nit: one less space in front of the =

[timvolodine, 2015/05/07 18:45:14]

Done.

+
 // Disables SVG 1.1 DOM.
 const char kDisableSVG1DOM[]                = "disable-svg1dom";