1 files changed, 143 insertions, 0 deletions
diff --git a/browser/base/content/test/performance/browser_tabopen.js b/browser/base/content/test/performance/browser_tabopen.js
new file mode 100644
index 0000000000..37b7ad3844
--- /dev/null
+++ b/browser/base/content/test/performance/browser_tabopen.js
@@ -0,0 +1,143 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * WHOA THERE: We should never be adding new things to EXPECTED_REFLOWS.
+ * Instead of adding reflows to the list, you should be modifying your code to
+ * avoid the reflow.
+ *
+ * See https://developer.mozilla.org/en-US/Firefox/Performance_best_practices_for_Firefox_fe_engineers
+ * for tips on how to do that.
+ */
+const EXPECTED_REFLOWS = [
+  /**
+   * Nothing here! Please don't add anything new!
+   */
+];
+
+/*
+ * This test ensures that there are no unexpected
+ * uninterruptible reflows when opening new tabs.
+ */
+add_task(async function() {
+  // Force-enable tab animations
+  gReduceMotionOverride = false;
+
+  await ensureNoPreloadedBrowser();
+  await disableFxaBadge();
+
+  // The test starts on about:blank and opens an about:blank
+  // tab which triggers opening the toolbar since
+  // ensureNoPreloadedBrowser sets AboutNewTab.newTabURL to about:blank.
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.toolbars.bookmarks.visibility", "never"]],
+  });
+
+  // Prepare the window to avoid flicker and reflow that's unrelated to our
+  // tab opening operation.
+  gURLBar.focus();
+
+  let tabStripRect = gBrowser.tabContainer.arrowScrollbox.getBoundingClientRect();
+
+  let firstTabRect = gBrowser.selectedTab.getBoundingClientRect();
+  let firstTabLabelRect = gBrowser.selectedTab.textLabel.getBoundingClientRect();
+  let textBoxRect = gURLBar
+    .querySelector("moz-input-box")
+    .getBoundingClientRect();
+
+  let inRange = (val, min, max) => min <= val && val <= max;
+
+  // Add a reflow observer and open a new tab.
+  await withPerfObserver(
+    async function() {
+      let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
+      BrowserOpenTab();
+      await BrowserTestUtils.waitForEvent(
+        gBrowser.selectedTab,
+        "TabAnimationEnd"
+      );
+      await switchDone;
+    },
+    {
+      expectedReflows: EXPECTED_REFLOWS,
+      frames: {
+        filter: rects =>
+          rects.filter(
+            r =>
+              !(
+                // We expect all changes to be within the tab strip.
+                (
+                  r.y1 >= tabStripRect.top &&
+                  r.y2 <= tabStripRect.bottom &&
+                  r.x1 >= tabStripRect.left &&
+                  r.x2 <= tabStripRect.right &&
+                  // The first tab should get deselected at the same time as the next
+                  // tab starts appearing, so we should have one rect that includes the
+                  // first tab but is wider.
+                  ((inRange(r.w, firstTabRect.width, firstTabRect.width * 2) &&
+                    r.x1 == firstTabRect.x) ||
+                  // The second tab gets painted several times due to tabopen animation.
+                  (inRange(
+                    r.x1,
+                    firstTabRect.right - 1, // -1 for the border on Win7
+                    firstTabRect.right + firstTabRect.width
+                  ) &&
+                    r.x2 < firstTabRect.right + firstTabRect.width + 25) || // The + 25 is because sometimes the '+' is in the same rect.
+                    // The '+' icon moves with an animation. At the end of the animation
+                    // the former and new positions can touch each other causing the rect
+                    // to have twice the icon's width.
+                    (r.h == 14 && r.w <= 2 * 14 + kMaxEmptyPixels) ||
+                    // We sometimes have a rect for the right most 2px of the '+' button.
+                    (r.h == 2 && r.w == 2) ||
+                    // Same for the 'X' icon.
+                    (r.h == 10 && r.w <= 2 * 10))
+                )
+              )
+          ),
+        exceptions: [
+          {
+            name:
+              "bug 1446452 - the new tab should appear at the same time as the" +
+              " previous one gets deselected",
+            condition: r =>
+              // In tab strip
+              r.y1 >= tabStripRect.top &&
+              r.y2 <= tabStripRect.bottom &&
+              // Position and size of the first tab.
+              r.x1 == firstTabRect.left &&
+              inRange(
+                r.w,
+                firstTabRect.width - 1, // -1 as the border doesn't change
+                firstTabRect.width
+              ),
+          },
+          {
+            name: "the urlbar placeolder moves up and down by a few pixels",
+            // This seems to only happen on the second run in --verify
+            condition: r =>
+              r.x1 >= textBoxRect.left &&
+              r.x2 <= textBoxRect.right &&
+              r.y1 >= textBoxRect.top &&
+              r.y2 <= textBoxRect.bottom,
+          },
+          {
+            name:
+              "bug 1477966 - the name of a deselected tab should appear immediately",
+            condition: r =>
+              AppConstants.platform == "macosx" &&
+              r.x1 >= firstTabLabelRect.x &&
+              r.x2 <= firstTabLabelRect.right &&
+              r.y1 >= firstTabLabelRect.y &&
+              r.y2 <= firstTabLabelRect.bottom,
+          },
+        ],
+      },
+    }
+  );
+
+  let switchDone = BrowserTestUtils.waitForEvent(window, "TabSwitchDone");
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+  await switchDone;
+});