Bug 1465480 - Clean up crash dumps in GeckoView tests r=jchen,esawin

We have tests that intentionally crash the content process. This
leaves crash dumps, but we don't want the harness to think that
this is something unexpected, so delete those when necessary.

MozReview-Commit-ID: 9CjmuvwOYwv

mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/rule/GeckoSessionTestRule.java

@@ -53,6 +53,7 @@
 import android.view.MotionEvent;
 import android.view.Surface;
 
+import java.io.File;
 import java.lang.annotation.Annotation;
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
@@ -1406,6 +1407,13 @@ protected boolean isUsingSession(final GeckoSession session) {
         return session.equals(mMainSession) || mSubSessions.contains(session);
     }
 
+    protected void deleteCrashDumps() {
+        File dumpDir = new File(sRuntime.getProfileDir(), "minidumps");
+        for (final File dump : dumpDir.listFiles()) {
+            dump.delete();
+        }
+    }
+
     protected void cleanupStatement() throws Throwable {
         mWaitScopeDelegates.clear();
         mTestScopeDelegates.clear();
@@ -1425,6 +1433,10 @@ protected void cleanupStatement() throws Throwable {
             cleanupSession(mMainSession);
         }
 
+        if (mIgnoreCrash) {
+            deleteCrashDumps();
+        }
+
         if (mDisplay != null) {
             mDisplay.surfaceDestroyed();
             mMainSession.releaseDisplay(mDisplay);

mobile/android/geckoview/src/main/java/org/mozilla/geckoview/GeckoRuntime.java

@@ -22,6 +22,8 @@
 import org.mozilla.gecko.util.GeckoBundle;
 import org.mozilla.gecko.util.ThreadUtils;
 
+import java.io.File;
+
 public final class GeckoRuntime implements Parcelable {
     private static final String LOGTAG = "GeckoRuntime";
     private static final boolean DEBUG = false;
@@ -231,6 +233,14 @@ public RuntimeTelemetry getTelemetry() {
 
     }
 
+    /**
+     * Get the profile directory for this runtime. This is where Gecko stores
+     * internal data.
+     */
+    public File getProfileDir() {
+        return GeckoThread.getActiveProfile().getDir();
+    }
+
     @Override // Parcelable
     public int describeContents() {
         return 0;