Remove SENSOR_EVENT from GeckoEvent and implement it as a native method
in GeckoAppShell that is invoked by the sensor event listener in
GeckoAppShell.
The number of recent successive crashes is now tracked wholly within Java, so we can remove the old Gecko pref and the associated reset code.
MozReview-Commit-ID: 7bR9wqJsLoi
GeckoThread.waitOnGecko blocks the current thread and waits for previous
events on the Gecko thread to finish executing before continuing. This
is implemented by synchronously running a dummy event on the Gecko
thread. This patch also lets us get rid of sendEventToGeckoSync in
GeckoAppShell.
Remove obsolete SIZE_CHANGED event and its handler in nsWindow. Also
remove some other supporting code (such as gAndroidBounds and the
FORCED_RESIZE event) that should be unnecessary by now.
Right now, we rely on browser.js sending Gecko:Ready, to set the
GeckoThread state to RUNNING upon receiving Gecko:Ready. This patch
gets rid of this dependency on browser.js and Gecko:Ready.
Implement the PrefsHelper native methods. The previous browser.js
implementation supported "pseudo-prefs" that did not exist as actual
prefs, but was accessible through PrefsHelper. In order to accommodate
these pseudo-prefs, we send observer notifications in order to
communicate with browser.js about prefs that we don't support.
In order to prevent the deadlock, we need to release sAppShellLock when
we start waiting in SyncRunEvent. However, we cannot simply unlock it
before the wait because that introduces an out-of-order unlocking wrt
mSyncRunMonitor, which can cause further deadlocks. So this patch
converts mSyncRunMoitor to a condvar and make it use sAppShellLock. That
then involves making aAppShellLock a Mutex instead of a StaticMutex. The
final result is having one lock (sAppShellLock), which supports any
other condvars that we have like mSyncRunFinished.
This patch moves the SyncRunEvent logic from GLControllerSupport to
nsAppShell, as it could be useful elsewhere. This patch fixes a race
condition related to shutdown, where a deadlock could occur if Gecko
shuts down when another thread is waiting for a synchronous event to
finish running. This patch also fixes a crash on shutdown when we tried
to create a mutex after the deadlock detector has shut down.
When getting nsAppShell from another thread, there could be a race with
nsAppShell being destroyed on the main thread. This patch makes the raw
nsAppShell pointer only accessible from the main thread, and use a
static mutex to coordinate accessing nsAppShell from other threads.
Right now LayerView depends on geckoConnected being called by GeckoApp
or GeckoView during its initialization. However, we can get rid of it
and let LayerView handle the task itself. As part of this change, screen
depth overriding is moved to native code in nsAppShell.
