908db6c633
This is split into a separate patch in an attempt to get a better diff. MozReview-Commit-ID: L9AI3VD2pbV
55 lines
1.8 KiB
JavaScript
55 lines
1.8 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* This process script is for small observers that we want to register
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* once per content process, usually in order to forward content-based
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* observer service notifications to the chrome process through
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* message passing. Using a process script avoids having them in
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* content.js and thereby registering N observers for N open tabs,
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* which is bad for perf.
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*/
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"use strict";
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const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
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Cu.import("resource://gre/modules/Services.jsm");
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var gEMEUIObserver = function(subject, topic, data) {
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let win = subject.top;
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let mm = getMessageManagerForWindow(win);
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if (mm) {
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mm.sendAsyncMessage("EMEVideo:ContentMediaKeysRequest", data);
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}
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};
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var gDecoderDoctorObserver = function(subject, topic, data) {
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let win = subject.top;
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let mm = getMessageManagerForWindow(win);
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if (mm) {
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mm.sendAsyncMessage("DecoderDoctor:Notification", data);
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}
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};
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function getMessageManagerForWindow(aContentWindow) {
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let ir = aContentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDocShell)
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.sameTypeRootTreeItem
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.QueryInterface(Ci.nsIInterfaceRequestor);
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try {
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// If e10s is disabled, this throws NS_NOINTERFACE for closed tabs.
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return ir.getInterface(Ci.nsIContentFrameMessageManager);
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} catch (e) {
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if (e.result == Cr.NS_NOINTERFACE) {
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return null;
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}
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throw e;
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}
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}
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Services.obs.addObserver(gEMEUIObserver, "mediakeys-request", false);
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Services.obs.addObserver(gDecoderDoctorObserver, "decoder-doctor-notification", false);
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