HTML Media Capture: update capture attribute to use string.

third_party/WebKit/Source/core/html/HTMLInputElement.idl

Index: third_party/WebKit/Source/core/html/HTMLInputElement.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLInputElement.idl b/third_party/WebKit/Source/core/html/HTMLInputElement.idl
index da1ac353ab4652680b30671bcc93d3269a31a725..b4d285127fb66789e2c1be9614ae0000f8166480 100644
--- a/third_party/WebKit/Source/core/html/HTMLInputElement.idl
+++ b/third_party/WebKit/Source/core/html/HTMLInputElement.idl
@@ -23,6 +23,9 @@
 
 enum SelectionMode { "select", "start", "end", "preserve" };
 
+// https://w3c.github.io/html-media-capture/#dom-capturefacingmode
+enum CaptureFacingMode { "user", "environment" };
+
 interface HTMLInputElement : HTMLElement {
     [CEReactions, Reflect] attribute DOMString accept;
     [CEReactions, Reflect] attribute DOMString alt;
@@ -103,9 +106,7 @@ interface HTMLInputElement : HTMLElement {
 
     // HTML Media Capture
     // https://w3c.github.io/html-media-capture/#the-capture-attribute
-    // TODO(mcasas): |capture| is a |CaptureFacingMode| enum in the spec.
-    // https://crbug.com/698853
-    [Measure, RuntimeEnabled=MediaCapture, Reflect] attribute boolean capture;
+    [Measure, RuntimeEnabled=MediaCapture, Reflect] attribute CaptureFacingMode capture;

[foolip, 2017/05/03 15:27:03]

I've filed https://github.com/w3c/html-media-capture/issues/12 because
the supporting bits for this were recently removed from HTML.

 
     // Non-standard APIs
     [Reflect, MeasureAs=PrefixedDirectoryAttribute] attribute boolean webkitdirectory;