Media Stream Image Capture (4): wire takePhoto and implement in FakeVCDevice

third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-takePhoto.html

Index: third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-takePhoto.html
diff --git a/third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-takePhoto.html b/third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-takePhoto.html
index b8d40007f7865d030c46fd188bb67c570729a533..a71a0f27c918487f19eb9f83e33531ce6cf920b4 100644
--- a/third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-takePhoto.html
+++ b/third_party/WebKit/LayoutTests/fast/imagecapture/ImageCapture-takePhoto.html
@@ -20,12 +20,13 @@ var test = async_test(function() {
 
   capturer.takePhoto()
     .then(blob => {
-      assert_true(blob.type.length > 0);
-      assert_true(blob.size > 0);
-      this.done();
+      assert_unreached('takePhoto() should not have been resolved');
     })
     .catch(error => {
-      assert_unreached('Error during takePhoto(): '+ error);
+      // LayoutTests do not have a real or a fake camera whatsoever, so content
+      // will not find a matching device for the Track's source id, and the
+      // promise will be rejected.

[mlamouri (slow - plz ping), 2016/05/09 12:44:35]

Are you planning to fix this? Should you have a TODO pointing to a bug in order
to add a mock in the test runner?

[mcasas, 2016/05/09 16:48:41]

Done. It essentially means tapping the source id
being passed around, and then having a mojo
mock interface implementation a la USB (with a
mojo mock "service" in JS).

+      this.done();
     });
 }, 'exercises the ImageCapture API takePhoto().');