WebLayer: Ignore strictmode violations in startup path

These disk reads on the main thread are working as intended and safe
enough to ignore.

Change-Id: I67a9a2b94e26c97c7427d283a239acefc7a400a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899615
Commit-Queue: Tim Sergeant <tsergeant@chromium.org>
Auto-Submit: Tim Sergeant <tsergeant@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712682}

weblayer/browser/java/org/chromium/weblayer_private/WebLayerImpl.java

@@ -17,6 +17,7 @@ import org.chromium.base.CommandLine;
 import org.chromium.base.ContentUriUtils;
 import org.chromium.base.ContextUtils;
 import org.chromium.base.PathUtils;
+import org.chromium.base.StrictModeContext;
 import org.chromium.base.annotations.UsedByReflection;
 import org.chromium.base.library_loader.LibraryLoader;
 import org.chromium.base.library_loader.LibraryProcessType;
@@ -98,13 +99,21 @@ public final class WebLayerImpl extends IWebLayer.Stub {
                 "org.chromium.weblayer.ChildProcessService$Sandboxed");
 
         if (!CommandLine.isInitialized()) {
+            // This disk read in the critical path is for development purposes only.
+            // TODO: Move it to debug-only (similar to WebView), or allow clients to configure the
+            // command line.
+            try (StrictModeContext ignored = StrictModeContext.allowDiskReads()) {
                 CommandLine.initFromFile(COMMAND_LINE_FILE);
             }
+        }
 
         DeviceUtils.addDeviceSpecificUserAgentSwitch();
         ContentUriUtils.setFileProviderUtil(new FileProviderHelper());
 
+        // TODO: Validate that doing this disk IO on the main thread is necessary.
+        try (StrictModeContext ignored = StrictModeContext.allowDiskReads()) {
             LibraryLoader.getInstance().ensureInitialized(LibraryProcessType.PROCESS_WEBLAYER);
+        }
         GmsBridge.getInstance().setSafeBrowsingHandler();
 
         final ValueCallback<Boolean> loadedCallback = (ValueCallback<Boolean>) ObjectWrapper.unwrap(