Bug 975931. Part 7: Enable APZC in reftests. r=dbaron

--HG--
extra : rebase_source : 74c33e5b5f4e8aa59199e488cb7606527d7beaec

layout/tools/reftest/reftest-cmdline.js

@@ -107,6 +107,13 @@ RefTestCmdLineHandler.prototype =
     branch.setBoolPref("security.fileuri.strict_origin_policy", false);
     // Disable the thumbnailing service
     branch.setBoolPref("browser.pagethumbnails.capturing_disabled", true);
+    // Enable APZC so we can test it
+    branch.setBoolPref("layers.async-pan-zoom.enabled", true);
+    // Since our tests are 800px wide, set the assume-designed-for width of all
+    // pages to be 800px (instead of the default of 980px). This ensures that
+    // in our 800px window we don't zoom out by default to try to fit the
+    // assumed 980px content.
+    branch.setIntPref("browser.viewport.desktopWidth", 800);
 
     var wwatch = Components.classes["@mozilla.org/embedcomp/window-watcher;1"]
                            .getService(nsIWindowWatcher);

layout/tools/reftest/reftest.js

@@ -267,6 +267,7 @@ this.OnRefTestLoad = function OnRefTestLoad(win)
     gBrowser.setAttribute("id", "browser");
     gBrowser.setAttribute("type", "content-primary");
     gBrowser.setAttribute("remote", gBrowserIsRemote ? "true" : "false");
+    gBrowser.setAttribute("mozasyncpanzoom", "true");
     // Make sure the browser element is exactly 800x1000, no matter
     // what size our window is
     gBrowser.setAttribute("style", "min-width: 800px; min-height: 1000px; max-width: 800px; max-height: 1000px");