/**
* The {@link DeviceClassManager} constructor should be self contained and rely on system
* information and command line flags.
*/
private DeviceClassManager() {
// Device based configurations.
if (SysUtils.isLowEndDevice()) {
mEnableSnapshots = false;
mEnableLayerDecorationCache = true;
mEnableAccessibilityLayout = true;
mEnableAnimations = false;
mEnablePrerendering = false;
mEnableToolbarSwipe = false;
mDisableDomainReliability = true;
} else {
mEnableSnapshots = true;
mEnableLayerDecorationCache = true;
mEnableAccessibilityLayout = false;
mEnableAnimations = true;
mEnablePrerendering = true;
mEnableToolbarSwipe = true;
mDisableDomainReliability = false;
}
if (DeviceFormFactor.isTablet(ApplicationStatus.getApplicationContext())) {
mEnableAccessibilityLayout = false;
}
// Flag based configurations.
CommandLine commandLine = CommandLine.getInstance();
mEnableAccessibilityLayout |=
commandLine.hasSwitch(ChromeSwitches.ENABLE_ACCESSIBILITY_TAB_SWITCHER);
mEnableFullscreen = !commandLine.hasSwitch(ChromeSwitches.DISABLE_FULLSCREEN);
mEnableUndo = commandLine.hasSwitch(ChromeSwitches.ENABLE_HIGH_END_UI_UNDO);
mEnableToolbarSwipeInDocumentMode =
commandLine.hasSwitch(ChromeSwitches.ENABLE_TOOLBAR_SWIPE_IN_DOCUMENT_MODE);
// Related features.
if (mEnableAccessibilityLayout) {
mEnableAnimations = false;
}
if (SysUtils.isLowEndDevice() || mEnableAccessibilityLayout) {
mEnableUndo = true;
}
}
/**
* Once native is loaded we can consult the command-line (set via about:flags) and also finch
* state to see if we should enable WebAPKs.
*/
public static void cacheEnabledStateForNextLaunch() {
boolean wasEnabled = isEnabledInPrefs();
CommandLine instance = CommandLine.getInstance();
String experiment = FieldTrialList.findFullName(WEBAPK_DISABLE_EXPERIMENT_NAME);
boolean isEnabled =
(!WEBAPK_RUNTIME_DISABLED.equals(experiment)
&& instance.hasSwitch(ChromeSwitches.ENABLE_WEBAPK));
if (isEnabled != wasEnabled) {
Log.d(TAG, "WebApk setting changed (%s => %s)", wasEnabled, isEnabled);
ChromePreferenceManager.getInstance(ContextUtils.getApplicationContext())
.setCachedWebApkRuntimeEnabled(isEnabled);
}
}
/** Turn on StrictMode detection based on build and command-line switches. */
@UiThread
// FindBugs doesn't like conditionals with compile time results
@SuppressFBWarnings("UCF_USELESS_CONTROL_FLOW")
public static void configureStrictMode() {
assert ThreadUtils.runningOnUiThread();
if (sIsStrictModeAlreadyConfigured) {
return;
}
sIsStrictModeAlreadyConfigured = true;
StrictMode.ThreadPolicy.Builder threadPolicy =
new StrictMode.ThreadPolicy.Builder(StrictMode.getThreadPolicy());
StrictMode.VmPolicy.Builder vmPolicy =
new StrictMode.VmPolicy.Builder(StrictMode.getVmPolicy());
CommandLine commandLine = CommandLine.getInstance();
if ("eng".equals(Build.TYPE)
|| BuildConfig.DCHECK_IS_ON
|| ChromeVersionInfo.isLocalBuild()
|| commandLine.hasSwitch(ChromeSwitches.STRICT_MODE)) {
turnOnDetection(threadPolicy, vmPolicy);
addDefaultPenalties(threadPolicy, vmPolicy);
if ("death".equals(commandLine.getSwitchValue(ChromeSwitches.STRICT_MODE))) {
addThreadDeathPenalty(threadPolicy);
addVmDeathPenalty(vmPolicy);
} else if ("testing".equals(commandLine.getSwitchValue(ChromeSwitches.STRICT_MODE))) {
addThreadDeathPenalty(threadPolicy);
// Currently VmDeathPolicy kills the process, and is not visible on bot test output.
}
}
// Enroll 1% of dev sessions into StrictMode watch. This is done client-side rather than
// through finch because this decision is as early as possible in the browser initialization
// process. We need to detect early start-up StrictMode violations before loading native and
// before warming the SharedPreferences (that is a violation in an of itself). We will
// closely monitor this on dev channel.
boolean enableStrictModeWatch =
(ChromeVersionInfo.isDevBuild() && Math.random() < UPLOAD_PROBABILITY);
if ((ChromeVersionInfo.isLocalBuild() && !BuildConfig.DCHECK_IS_ON) || enableStrictModeWatch) {
turnOnDetection(threadPolicy, vmPolicy);
initializeStrictModeWatch();
}
StrictMode.setThreadPolicy(threadPolicy.build());
StrictMode.setVmPolicy(vmPolicy.build());
}