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 2168c21827fddcd17c1d7d2f5de4d0dd17155a62..0524049fd21a9d7588753027e4764ea4802a9c07 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
@@ -164,6 +164,7 @@ public class LibraryLoader {
             Context context, boolean shouldDeleteFallbackLibraries)
             throws ProcessInitException {
         try {
+            TraceEvent.begin("LibraryLoader.loadAlreadyLocked");
             if (!sLoaded) {
                 assert !sInitialized;
 
@@ -291,6 +292,8 @@ public class LibraryLoader {
             }
         } catch (UnsatisfiedLinkError e) {
             throw new ProcessInitException(LoaderErrors.LOADER_ERROR_NATIVE_LIBRARY_LOAD_FAILED, e);
+        } finally {
+            TraceEvent.end("LibraryLoader.loadAlreadyLocked");
         }
         // Check that the version of the library we have loaded matches the version we expect
         Log.i(TAG, String.format(