Fix MinidumpUploadServiceImpl to add application listener on UiThread.

ApplicationListener internally uses ObserverList to track observers, and
while ObserverList says it should only be used on a single thread, we
violate that condition a lot (especially in tests).

Initially, the CL was added a ThreadChecker to ObserverList that was
default enabled, but this broke THE WORLD. So, this instead adds one that
is disabled by default using a static boolean, which allows slowly
addressing the tests.

In the meantime, this CL attempts to solve some of the easier test
issues and low hanging fruit.

BUG=1225878

Change-Id: I745d4c8d382d5af4bde4c8450abdb9bae0c33596
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3031817
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#903642}

• android_webview/javatests/src/org/chromium/android_webview/test/AwContentsAnchorViewTest.java[diff]
• android_webview/javatests/src/org/chromium/android_webview/test/AwContentsLifecycleNotifierTest.java[diff]
• base/android/java/src/org/chromium/base/ApplicationStatus.java[diff]
• base/android/java/src/org/chromium/base/ObserverList.java[diff]
• base/test/android/javatests/src/org/chromium/base/test/util/InMemorySharedPreferences.java[diff]
• chrome/android/features/autofill_assistant/javatests/src/org/chromium/chrome/browser/autofill_assistant/AutofillAssistantActionsCarouselUiTest.java[diff]
• chrome/android/java/src/org/chromium/chrome/browser/crash/MinidumpUploadServiceImpl.java[diff]
• chrome/android/java/src/org/chromium/chrome/browser/metrics/MainIntentBehaviorMetrics.java[diff]
• chrome/android/javatests/src/org/chromium/chrome/browser/ActivityTabProviderTest.java[diff]
• chrome/android/javatests/src/org/chromium/chrome/browser/app/metrics/TabbedActivityLaunchCauseMetricsTest.java[diff]
• chrome/android/javatests/src/org/chromium/chrome/browser/attribution_reporting/AttributionIntentIntegrationTest.java[diff]
• chrome/android/javatests/src/org/chromium/chrome/browser/tabmodel/TabPersistentStoreTest.java[diff]
• chrome/test/android/javatests/src/org/chromium/chrome/test/util/ChromeTabUtils.java[diff]
• content/public/android/javatests/src/org/chromium/content/browser/VSyncPausedTest.java[diff]