Every JS plugin is assigned a unique ID. When an instance of a JS plugin is created the
frame loader that we use to load the plugin's handler URI will create a special
TabContext. This TabContext causes the ContentParent to use the process for this specific
JS plugin (creating one if it hasn't already) when it creates the PBrowser actors.
This causes the iframes for all the instances of a specific JS plugin to be grouped in the
same process.
--HG--
extra : rebase_source : c39560bdf66cda1a005c7b823b3a46e4734878a4
extra : source : 9cba1db527c7eed4371c9f4caf96fd942608cab6
This patch removes support for mozapp iframes, leaving support for
mozbrowser iframes intact. Some of the code has been rewritten in order
to phrase things in terms of mozbrowser only, as opposed to mozbrowser
or app. In some places, code that was only useful with apps has been
completely removed, so that the APIs consumed can also be removed. In
some places where the notion of appId was bleeding out of this API, now
we use NO_APP_ID. Other notions of appId which were restricted to this
API have been removed.
This patch removes support for mozapp iframes, leaving support for
mozbrowser iframes intact. Some of the code has been rewritten in order
to phrase things in terms of mozbrowser only, as opposed to mozbrowser
or app. In some places, code that was only useful with apps has been
completely removed, so that the APIs consumed can also be removed. In
some places where the notion of appId was bleeding out of this API, now
we use NO_APP_ID. Other notions of appId which were restricted to this
API have been removed.
This change renames TabContext::IsBrowserElement to IsIsolatedMozBrowserElement.
Other methods that pass these values around also have name changes.
Adds TabContext::IsMozBrowserElement which is set by the frame loader for all
browser frames. This is in contrast to its previous implementation, which has
since been renamed IsIsolatedMozBrowserElement, since it checks isolated state
in OriginAttributes.
TabContext methods related to browser elements (and their callers) are updated
to use IsIsolatedMozBrowserElement when check isolation / origins and
IsMozBrowserElement when checking frame types.
MozReview-Commit-ID: DDMZTkSn5yd
The ScrollingBehavior passed around extensively in TabParent/TabChild is
entirely redundant now that the layers.async-pan-zoom.enabled pref definitively
controls whether or not APZ is enabled. All the code related to ScrollingBehavior
can be removed.
This change reworks how TabContext stores its data. Before, it stored
an app-id and translated that into an app; now we do the reverse. This
lets us guarantee that HasOwnApp() is true iff GetOwnApp() is non-null.
We added a new class, MaybeInvalidTabContext to assist with converting
from an IPCTabContext to a TabContext. This allows us to ensure that a
TabContext object is never invalid.
This change reworks how TabContext stores its data. Before, it stored
an app-id and translated that into an app; now we do the reverse. This
lets us guarantee that HasOwnApp() is true iff GetOwnApp() is non-null.
We added a new class, MaybeInvalidTabContext to assist with converting
from an IPCTabContext to a TabContext. This allows us to ensure that a
TabContext object is never invalid.
--HG--
extra : rebase_source : d43e858739a342ab420122a90336bfd585be268a
This is a rollup of the following patches
Bug 811315, part 0.9: Fix pre-existing race condition that allows dying ContentParents to accidentally try to load new TabParents. r=jlebar
Bug 811315, part 0.91: Fix another pre-existing race condition where FirstIdle might run after ContentChild::ActorDestroy(). r=jlebar
Bug 811315, part 1: Make "browser" process limit infinite and unload the processes when all tabs are closed. Firefox with process-per-tab! r=jlebar
Bug 811315, part 2: Pass scrolling-behavior hint down into TabParent instead of inferring it from app/browser. r=jlebar
Bug 811315, part 3: Add a mozasyncpanzoom attribute for iframes and honor it when constructing a remote frame. r=jlebar sr=roc
The main bug fixed here is that in half of our interfaces, we use "is browser frame/element" to mean "browser or app", and in the other half, we use it to mean "is browser not app".
There's a related, functional bug also fixed here, which is that a browser process doesn't inherit its parent's app-id. This causes problems e.g. for IndexedDB: If a browser inside an app uses IndexedDB, the DB should have the app's app-id.
I also modified Tab{Parent,Child} and nsFrameLoader to call "app" "ownOrContainingApp", to emphasize that we might have inherited the app from a parent process. I left nsIDocShell::appId alone, because changing that would have necessitated changing nsILoadGroup and therefore a /lot/ of users in Necko; it's also not clear it would have clarified anything in those cases.
The main bug fixed here is that in half of our interfaces, we use "is browser frame/element" to mean "browser or app", and in the other half, we use it to mean "is browser not app".
There's a related, functional bug also fixed here, which is that a browser process doesn't inherit its parent's app-id. This causes problems e.g. for IndexedDB: If a browser inside an app uses IndexedDB, the DB should have the app's app-id.
I also modified Tab{Parent,Child} and nsFrameLoader to call "app" "ownOrContainingApp", to emphasize that we might have inherited the app from a parent process. I left nsIDocShell::appId alone, because changing that would have necessitated changing nsILoadGroup and therefore a /lot/ of users in Necko; it's also not clear it would have clarified anything in those cases.
Sylvestre Ledru
Mike Conley
Nika Layzell
Peter Van der Beken
Andrea Marchesini
Ehsan Akhgari
Carsten "Tomcat" Book
Valentin Gosu
Alexandre Lissy
Neil Deakin
James Andreou
Shih-Chiang Chien
Samael Wang
Ryan VanderMeulen
J. Ryan Stinnett
Yoshi Huang
Henry
Steven Englehardt
Andrew McCreight
Kartikaya Gupta
Birunthan Mohanathas
Robert O'Callahan
Justin Lebar
Jon Hylands
Chris Jones