[Android] Workaround of an android platform bug.

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 9dc77fc8c006cfdb5c1c5c9d40327833f75f7cd2..0649db9e5af0a3eb69ec46545d211abe3506a32c 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
@@ -4,6 +4,7 @@
 
 package org.chromium.base.library_loader;
 
+import android.content.Context;
 import android.os.SystemClock;
 import android.util.Log;
 
@@ -41,6 +42,11 @@ public class LibraryLoader {
     // library_loader_hooks.cc).
     private static boolean sInitialized = false;
 
+    // One-way switch becomes true if the system library loading failed,
+    // and the right native library was found and loaded by the hack.
+    // The flag is used to report UMA stats later.
+    public static boolean sNativeLibraryHack = false;
+
     // TODO(cjhopman): Remove this once it's unused.
     /**
      * Doesn't do anything.
@@ -52,13 +58,14 @@ public class LibraryLoader {
     /**
      *  This method blocks until the library is fully loaded and initialized.
      */
-    public static void ensureInitialized() throws ProcessInitException {
+    public static void ensureInitialized(Context context, boolean isBrowserProcess)
+        throws ProcessInitException {
         synchronized (sLock) {
             if (sInitialized) {
                 // Already initialized, nothing to do.
                 return;
             }
-            loadAlreadyLocked();
+            loadAlreadyLocked(context, isBrowserProcess);
             initializeAlreadyLocked(CommandLine.getJavaSwitchesOrNull());
         }
     }
@@ -81,9 +88,10 @@ public class LibraryLoader {
      *
      * @throws ProcessInitException if the native library failed to load.
      */
-    public static void loadNow() throws ProcessInitException {
+    public static void loadNow(Context context, boolean isBrowserProcess)
+        throws ProcessInitException {
         synchronized (sLock) {
-            loadAlreadyLocked();
+          loadAlreadyLocked(context, isBrowserProcess);
         }
     }
 
@@ -103,7 +111,8 @@ public class LibraryLoader {
 
 
     // Invoke System.loadLibrary(...), triggering JNI_OnLoad in native code
-    private static void loadAlreadyLocked() throws ProcessInitException {
+    private static void loadAlreadyLocked(Context context, boolean isBrowserProcess)
+        throws ProcessInitException {
         try {
             if (!sLoaded) {
                 assert !sInitialized;
@@ -118,8 +127,19 @@ public class LibraryLoader {
                     Log.i(TAG, "Loading: " + library);
                     if (useChromiumLinker)
                         Linker.loadLibrary(library);
-                    else
-                        System.loadLibrary(library);
+                    else {
+                        try {
+                            System.loadLibrary(library);
+                        } catch (UnsatisfiedLinkError e) {
+                            // Try to load from backup directory.
+                            if (LibraryLoaderHelper.tryLoadLibraryUsingWorkaround(
+                                context, library, isBrowserProcess)) {
+                                sNativeLibraryHack = true;
+                            } else {
+                                throw e;
+                            }
+                        }
+                    }
                 }
                 if (useChromiumLinker)
                     Linker.finishLibraryLoad();
@@ -143,9 +163,11 @@ public class LibraryLoader {
             throw new ProcessInitException(LoaderErrors.LOADER_ERROR_NATIVE_LIBRARY_WRONG_VERSION);
         }
 
+        if (isBrowserProcess) {
+            LibraryLoaderHelper.cleanupOldLibraries(context, !sNativeLibraryHack);
+        }
     }
 
-
     // Invoke base::android::LibraryLoaded in library_loader_hooks.cc
     private static void initializeAlreadyLocked(String[] initCommandLine)
             throws ProcessInitException {