[Picture-in-Picture] Test aspect ratio in web platform tests.

Change-Id: Ic0ab988927938f42234895d68e65779b9fbb4c5e
Reviewed-on: https://chromium-review.googlesource.com/c/1288430Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#602325}

content/shell/browser/shell.cc

@@ -606,9 +606,9 @@ bool Shell::ShouldAllowRunningInsecureContent(
 
 gfx::Size Shell::EnterPictureInPicture(const viz::SurfaceId& surface_id,
                                        const gfx::Size& natural_size) {
-  // During tests, returning a fake window size to pretent the window was
-  // created and allow tests to run accordingly.
-  return switches::IsRunWebTestsSwitchPresent() ? gfx::Size(42, 42)
+  // During tests, returning a fake window size (same aspect ratio) to pretend
+  // the window was created and allow tests to run accordingly.
+  return switches::IsRunWebTestsSwitchPresent() ? natural_size
                                                 : gfx::Size(0, 0);
 }
 

third_party/WebKit/LayoutTests/external/wpt/picture-in-picture/picture-in-picture-window.html

@@ -14,6 +14,9 @@ promise_test(async t => {
   .then(pipWindow => {
     assert_not_equals(pipWindow.width, 0);
     assert_not_equals(pipWindow.height, 0);
+    const videoAspectRatio = video.videoWidth / video.videoHeight;
+    const pipWindowAspectRatio = pipWindow.width / pipWindow.height;
+    assert_equals(videoAspectRatio, pipWindowAspectRatio);
   });
 }, 'Picture-in-Picture window dimensions are set after entering Picture-in-Picture');