[Sampling profiler] Annotate module installer Module with @MainDex

The annotation is required to load modules via JNI calls in the renderer
process, as done for the sampling profiler.

Bug: 1004855
Change-Id: I729edef2cbcb434177ec0d91e827f8839b6516c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274577
Commit-Queue: Mike Wittman <wittman@chromium.org>
Reviewed-by: Fred Mello <fredmello@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784061}

components/module_installer/android/java/src/org/chromium/components/module_installer/builder/Module.java

@@ -9,6 +9,7 @@ import androidx.annotation.VisibleForTesting;
 import org.chromium.base.BundleUtils;
 import org.chromium.base.StrictModeContext;
 import org.chromium.base.annotations.JNINamespace;
+import org.chromium.base.annotations.MainDex;
 import org.chromium.base.annotations.NativeMethods;
 import org.chromium.base.library_loader.LibraryLoader;
 import org.chromium.components.module_installer.engine.InstallEngine;
@@ -18,11 +19,12 @@ import org.chromium.components.module_installer.util.Timer;
 /**
  * Represents a feature module. Can be used to install the module, access its interface, etc. See
  * {@link ModuleInterface} for how to conveniently create an instance of the module class for a
- * specific feature module.
+ * specific feature module. The @MainDex annotation supports module use in the renderer process.
  *
  * @param <T> The interface of the module
  */
 @JNINamespace("module_installer")
+@MainDex
 public class Module<T> {
     private final String mName;
     private final Class<T> mInterfaceClass;