Display images in multiline Braille

chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
index e483f40de44b8eb657e834ab9f28c9904ab2851c..80700d9185bd631b5a07c8cc81b298b819fc0db8 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/command_handler.js
@@ -578,7 +578,23 @@ CommandHandler.onCommand = function(command) {
           .withRichSpeechAndBraille(current, null, Output.EventType.NAVIGATE)
           .go();
       return false;
-
+    case 'viewGraphicAsBraille':
+      // Find the first node within the current range that supports image data.
+      var imageNode = AutomationUtil.findNodePost(
+          current.start.node, Dir.FORWARD,
+          AutomationPredicate.supportsImageData);
+      if (imageNode) {
+        ChromeVoxState.instance.nodeDisplayingBrailleImage = imageNode;
+        if (imageNode.imageDataUrl) {
+          cvox.ChromeVox.braille.writeRawImage(imageNode.imageDataUrl);
+          cvox.ChromeVox.braille.freeze();
+        } else {
+          // Request image data. If it succeeds, we will get a
+          // IMAGE_FRAME_UPDATED event.
+          imageNode.getImageData(0, 0);

[David Tseng, 2017/02/24 05:39:46]

I think we should install the event handler directly on this node here so the
code to handle this isn't hidden elsewhere. Also, if we do that, you don't have
to explicitly track the node on ChromeVoxState.

[dmazzoni, 2017/02/27 06:56:24]

Done.

+        }
+      }
+      return false;
     // Table commands.
     case 'previousRow':
       dir = Dir.BACKWARD;