Add more options to --screen-config flag.

ui/display/fake_display_delegate.h

Index: ui/display/fake_display_delegate.h
diff --git a/ui/display/fake_display_delegate.h b/ui/display/fake_display_delegate.h
index d6d05ed8055937e919a60eb6430fe661a79ca58a..d6942c34c2a9c218430435bcd1011c42f79f86ee 100644
--- a/ui/display/fake_display_delegate.h
+++ b/ui/display/fake_display_delegate.h
@@ -27,15 +27,23 @@ namespace display {
 //
 // The size and number of displays can controlled via --screen-config=X
 // command line flag with the format:
-//   HxW[^dpi][,]
+//   HxW[%R][#HxW[%R][:HxW[%R]]][^D][/[a][c][i][o]][,...]

[Daniel Erat, 2016/10/05 21:09:45]

can you document what the #- and :-prefixed dimensions do? i take it from the
example below that '#' is used to list a second mode.

[kylechar, 2016/10/07 16:14:42]

Improved this comment a bunch I hope.

 //     H: display height in pixels [int]
 //     W: display width in pixels [int]
-//     dpi: display physical size set based on DPI [int]
+//     R: display refresh rate [float]
+//     D: display DPI, used to set physical size [int]
+//     Options:
+//      a: display is aspect preserving
+//      c: display has color correction matrix
+//      i: display is internal
+//      o: display has overscan
 //
-// Two 800x800 displays:
-//  --screen-config=800x800,800x800
-// One 1820x1080 display and one 400x400 display:
-//  --screen-config=1920x1080,400x400
+// Two 800x800 displays, with first display as internal display:
+//  --screen-config=800x800/i,800x800
+// One 1920x1080 display as internal display with alternate resolutions:
+//  --screen-config=1920x1080#1600x900:1280x720/i
+// One 1600x900 display with 120 refresh rate and high-DPI:
+//   --screen-config=1600x900%120^300
 // No displays:
 //  --screen-config=none
 //
@@ -89,11 +97,6 @@ class DISPLAY_EXPORT FakeDisplayDelegate : public ui::NativeDisplayDelegate,
   FakeDisplayController* GetFakeDisplayController() override;
 
  protected:
-  // Creates a display snapshot from the provided |spec| string. Return null if
-  // |spec| is invalid.
-  std::unique_ptr<ui::DisplaySnapshot> CreateSnapshotFromSpec(
-      const std::string& spec);
-
   // Sets initial display snapshots from command line flag. Returns true if
   // command line flag was provided.
   bool InitFromCommandLine();