TracingControllerAndroidImpl: Ignore strict mode violation

Ignore a strict mode violation from reading external storage state. We
could do this on a background thread, but since this code path is used for
early startup tracing, we want to minimize how much tracing changes the
normal control flow of the program.

TBR=dtrainor@chromium.org

Bug: 869794
Change-Id: I179a155a2560868839b0610d078e070da3cdfce1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845712Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704142}

content/public/android/java/src/org/chromium/content/browser/TracingControllerAndroidImpl.java

@@ -14,6 +14,7 @@ import android.util.Pair;
 
 import org.chromium.base.Callback;
 import org.chromium.base.Log;
+import org.chromium.base.StrictModeContext;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.annotations.NativeMethods;
@@ -123,21 +124,21 @@ public class TracingControllerAndroidImpl implements TracingControllerAndroid {
      */
     @CalledByNative
     private static String generateTracingFilePath() {
-        String state = Environment.getExternalStorageState();
-        if (!Environment.MEDIA_MOUNTED.equals(state)) {
-            return null;
-        }
+        try (StrictModeContext ignored = StrictModeContext.allowDiskWrites()) {
+            String state = Environment.getExternalStorageState();
+            if (!Environment.MEDIA_MOUNTED.equals(state)) {
+                return null;
+            }
 
-        // Generate a hopefully-unique filename using the UTC timestamp.
-        // (Not a huge problem if it isn't unique, we'll just append more data.)
-        SimpleDateFormat formatter = new SimpleDateFormat(
-                "yyyy-MM-dd-HHmmss", Locale.US);
-        formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
-        File dir = Environment.getExternalStoragePublicDirectory(
-                Environment.DIRECTORY_DOWNLOADS);
-        File file = new File(
-                dir, "chrome-profile-results-" + formatter.format(new Date()));
-        return file.getPath();
+            // Generate a hopefully-unique filename using the UTC timestamp.
+            // (Not a huge problem if it isn't unique, we'll just append more data.)
+            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HHmmss", Locale.US);
+            formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
+            File dir =
+                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
+            File file = new File(dir, "chrome-profile-results-" + formatter.format(new Date()));
+            return file.getPath();
+        }
     }
 
     /**