Annotate simple fingerprinting attributes with HighEnropy=Direct.

This web IDL annotation will automatically add instrumentation with
the bindings code to record how much entropy these APIs leak about
users' cross-site identity.

Bug: 973801
Change-Id: Ie4d1aa3483bd1883511ccc46d9e4cb2879884c22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302726Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: Nate Chapin <japhet@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Dylan Cutler <dylancutler@google.com>
Cr-Commit-Position: refs/heads/master@{#791530}

third_party/blink/renderer/core/frame/visual_viewport.idl

@@ -30,16 +30,16 @@
     Exposed=Window,
     ImplementedAs=DOMVisualViewport
 ] interface VisualViewport : EventTarget {
-    [HighEntropy, Measure] readonly attribute double offsetLeft;
-    [HighEntropy, Measure] readonly attribute double offsetTop;
+    [HighEntropy=Direct, Measure] readonly attribute double offsetLeft;
+    [HighEntropy=Direct, Measure] readonly attribute double offsetTop;
 
-    [HighEntropy, Measure] readonly attribute double pageLeft;
-    [HighEntropy, Measure] readonly attribute double pageTop;
+    [HighEntropy=Direct, Measure] readonly attribute double pageLeft;
+    [HighEntropy=Direct, Measure] readonly attribute double pageTop;
 
-    [HighEntropy, Measure] readonly attribute double width;
-    [HighEntropy, Measure] readonly attribute double height;
+    [HighEntropy=Direct, Measure] readonly attribute double width;
+    [HighEntropy=Direct, Measure] readonly attribute double height;
 
-    [HighEntropy, Measure] readonly attribute double scale;
+    [HighEntropy=Direct, Measure] readonly attribute double scale;
 
     attribute EventHandler onresize;
     attribute EventHandler onscroll;

third_party/blink/renderer/core/frame/window.idl

@@ -130,8 +130,8 @@
     [MeasureAs=WindowResize] void resizeBy(long x, long y);
 
     // viewport
-    [Affects=Nothing, HighEntropy, MeasureAs=WindowInnerWidth, Replaceable] readonly attribute long innerWidth;
-    [Affects=Nothing, HighEntropy, MeasureAs=WindowInnerHeight, Replaceable] readonly attribute long innerHeight;
+    [Affects=Nothing, HighEntropy=Direct, MeasureAs=WindowInnerWidth, Replaceable] readonly attribute long innerWidth;
+    [Affects=Nothing, HighEntropy=Direct, MeasureAs=WindowInnerHeight, Replaceable] readonly attribute long innerHeight;
 
     // viewport scrolling
     [HighEntropy, MeasureAs=WindowScrollX, Replaceable] readonly attribute double scrollX;
@@ -150,11 +150,11 @@
     [Replaceable, SameObject] readonly attribute VisualViewport visualViewport;
 
     // client
-    [Affects=Nothing, HighEntropy, MeasureAs=WindowScreenX, Replaceable] readonly attribute long screenX;
-    [Affects=Nothing, HighEntropy, MeasureAs=WindowScreenY, Replaceable] readonly attribute long screenY;
-    [Affects=Nothing, HighEntropy, MeasureAs=WindowOuterWidth, Replaceable] readonly attribute long outerWidth;
-    [Affects=Nothing, HighEntropy, MeasureAs=WindowOuterHeight, Replaceable] readonly attribute long outerHeight;
-    [Affects=Nothing, HighEntropy, MeasureAs=WindowDevicePixelRatio, Replaceable] readonly attribute double devicePixelRatio;
+    [Affects=Nothing, HighEntropy=Direct, MeasureAs=WindowScreenX, Replaceable] readonly attribute long screenX;
+    [Affects=Nothing, HighEntropy=Direct, MeasureAs=WindowScreenY, Replaceable] readonly attribute long screenY;
+    [Affects=Nothing, HighEntropy=Direct, MeasureAs=WindowOuterWidth, Replaceable] readonly attribute long outerWidth;
+    [Affects=Nothing, HighEntropy=Direct, MeasureAs=WindowOuterHeight, Replaceable] readonly attribute long outerHeight;
+    [Affects=Nothing, HighEntropy=Direct, MeasureAs=WindowDevicePixelRatio, Replaceable] readonly attribute double devicePixelRatio;
 
     // Window Segments API
     // https://github.com/webscreens/window-segments
@@ -176,7 +176,7 @@
     // This is the interface orientation in degrees. Some examples are:
     //  0 is straight up; -90 is when the device is rotated 90 clockwise;
     //  90 is when rotated counter clockwise.
-    [HighEntropy, MeasureAs=WindowOrientation, RuntimeEnabled=OrientationEvent] readonly attribute long orientation;
+    [HighEntropy=Direct, MeasureAs=WindowOrientation, RuntimeEnabled=OrientationEvent] readonly attribute long orientation;
 
     // Accessibility Object Model
     // https://github.com/WICG/aom/blob/HEAD/explainer.md
@@ -198,8 +198,8 @@
                                         optional boolean searchInFrames = false,
                                         optional boolean showDialog = false);
     [MeasureAs=WindowOffscreenBuffering, Replaceable, NotEnumerable] readonly attribute boolean offscreenBuffering;
-    [HighEntropy, MeasureAs=WindowScreenLeft, Replaceable] readonly attribute long screenLeft;
-    [HighEntropy, MeasureAs=WindowScreenTop, Replaceable] readonly attribute long screenTop;
+    [HighEntropy=Direct, MeasureAs=WindowScreenLeft, Replaceable] readonly attribute long screenLeft;
+    [HighEntropy=Direct, MeasureAs=WindowScreenTop, Replaceable] readonly attribute long screenTop;
     [MeasureAs=WindowDefaultStatus] attribute DOMString defaultStatus;
     [MeasureAs=WindowDefaultstatus, ImplementedAs=defaultStatus] attribute DOMString defaultstatus;
     [MeasureAs=StyleMedia] readonly attribute StyleMedia styleMedia;

third_party/blink/renderer/modules/battery/battery_manager.idl

@@ -7,7 +7,7 @@
     ActiveScriptWrappable,
     Exposed=Window
 ] interface BatteryManager : EventTarget {
-    [HighEntropy, Measure] readonly attribute boolean charging;
+    [HighEntropy=Direct, Measure] readonly attribute boolean charging;
     [HighEntropy, Measure] readonly attribute unrestricted double chargingTime;
     [HighEntropy, Measure] readonly attribute unrestricted double dischargingTime;
     [HighEntropy, Measure] readonly attribute double level;