Add UMA for testing whether the Chromium library was page aligned in the APK file.

base/android/library_loader/library_loader_hooks.cc

Index: base/android/library_loader/library_loader_hooks.cc
diff --git a/base/android/library_loader/library_loader_hooks.cc b/base/android/library_loader/library_loader_hooks.cc
index 809275dc4314925601ca959628d7b3d78d6a8315..b7f3632eb42b9126e8b6cae10e90031e364bf331 100644
--- a/base/android/library_loader/library_loader_hooks.cc
+++ b/base/android/library_loader/library_loader_hooks.cc
@@ -98,6 +98,14 @@ static void RecordChromiumAndroidLinkerBrowserHistogram(
                             LIBRARY_LOAD_FROM_APK_STATUS_CODES_MAX);
 }
 
+static void RecordChromiumAndroidLinkerLibraryAlignmentInApk(
+    JNIEnv* env,
+    jclass clazz,
+    jboolean aligned) {
+  // Record whether the Chromium library is page aligned in the APK file.
+  UMA_HISTOGRAM_BOOLEAN("ChromiumAndroidLinker.LibraryAlignedInApk", aligned);
+}
+
 void SetLibraryLoadedHook(LibraryLoadedHook* func) {
   g_registration_callback = func;
 }