Add support for TraceEvent before the native library is loaded.

base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java

Index: base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java
diff --git a/base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java b/base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java
index 89cb5bb6de4d041466c1ff5e00693b2f30b096c1..75e9974306090d8c8359c713fb2d4606e70d73f6 100644
--- a/base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java
+++ b/base/android/java/src/org/chromium/base/library_loader/LibraryLoader.java
@@ -155,6 +155,7 @@ public class LibraryLoader {
             Context context, boolean shouldDeleteFallbackLibraries)
             throws ProcessInitException {
         try {
+            TraceEvent.begin();
             if (!sLoaded) {
                 assert !sInitialized;
 
@@ -269,6 +270,8 @@ public class LibraryLoader {
             }
         } catch (UnsatisfiedLinkError e) {
             throw new ProcessInitException(LoaderErrors.LOADER_ERROR_NATIVE_LIBRARY_LOAD_FAILED, e);
+        } finally {
+            TraceEvent.end();
         }
         // Check that the version of the library we have loaded matches the version we expect
         Log.i(TAG, String.format(