Library loading fallback.

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

Index: base/android/java/src/org/chromium/base/library_loader/Linker.java
diff --git a/base/android/java/src/org/chromium/base/library_loader/Linker.java b/base/android/java/src/org/chromium/base/library_loader/Linker.java
index c08005e3d1b4f4cbe5598dbe745f602ed8151d84..29fb1ac515ea4d1aff6e7fb61384b0f1fec17135 100644
--- a/base/android/java/src/org/chromium/base/library_loader/Linker.java
+++ b/base/android/java/src/org/chromium/base/library_loader/Linker.java
@@ -700,33 +700,17 @@ public class Linker {
     }
 
     /**
-     * Load a native shared library with the Chromium linker.
-     * The shared library is uncompressed and page aligned inside the zipfile.
-     * Note the crazy linker treats libraries and files as equivalent,
-     * so you can only open one library in a given zip file. The library must
-     * not be the Chromium linker library.
+     * Load a native shared library with the Chromium linker. If the zip file
+     * is not null, the shared library must be uncompressed and page aligned
+     * inside the zipfile. Note the crazy linker treats libraries and files as
+     * equivalent, so you can only open one library in a given zip file. The
+     * library must not be the Chromium linker library.
      *
-     * @param zipfile The filename of the zipfile contain the library.
-     * @param library The library's base name.
+     * @param zipFilename The filename of the zip file containing the library (or null).
+     * @param libFilename The filename of the library.
      */
-    public static void loadLibraryInZipFile(String zipfile, String library) {
-        loadLibraryMaybeInZipFile(zipfile, library);
-    }
-
-    /**
-     * Load a native shared library with the Chromium linker. The library must
-     * not be the Chromium linker library.
-     *
-     * @param library The library's base name.
-     */
-    public static void loadLibrary(String library) {
-        loadLibraryMaybeInZipFile(null, library);
-    }
-
-    private static void loadLibraryMaybeInZipFile(
-            @Nullable String zipFile, String library) {
-        if (DEBUG) Log.i(TAG, "loadLibrary: " + library);
-        assert !isChromiumLinkerLibrary(library);
+    public static void loadLibrary(@Nullable String zipFilename, String libFilename) {
+        if (DEBUG) Log.i(TAG, "loadLibrary: " + zipFilename + ", " + libFilename);
 
         synchronized (Linker.class) {
             ensureInitializedLocked();
@@ -737,12 +721,10 @@ public class Linker {
             // that wrap all calls to loadLibrary() in the library loader.
             assert sPrepareLibraryLoadCalled;
 
-            String libName = System.mapLibraryName(library);
-
             if (sLoadedLibraries == null) sLoadedLibraries = new HashMap<String, LibInfo>();
 
-            if (sLoadedLibraries.containsKey(libName)) {
-                if (DEBUG) Log.i(TAG, "Not loading " + libName + " twice");
+            if (sLoadedLibraries.containsKey(libFilename)) {
+                if (DEBUG) Log.i(TAG, "Not loading " + libFilename + " twice");
                 return;
             }
 
@@ -753,18 +735,18 @@ public class Linker {
                 loadAddress = sCurrentLoadAddress;
             }
 
-            String sharedRelRoName = libName;
-            if (zipFile != null) {
-                if (!nativeLoadLibraryInZipFile(zipFile, libName, loadAddress, libInfo)) {
-                    String errorMessage = "Unable to load library: " + libName +
-                                          ", in: " + zipFile;
+            String sharedRelRoName = libFilename;
+            if (zipFilename != null) {
+                if (!nativeLoadLibraryInZipFile(zipFilename, libFilename, loadAddress, libInfo)) {
+                    String errorMessage = "Unable to load library: " + libFilename +
+                                          ", in: " + zipFilename;
                     Log.e(TAG, errorMessage);
                     throw new UnsatisfiedLinkError(errorMessage);
                 }
-                sharedRelRoName = zipFile;
+                sharedRelRoName = zipFilename;
             } else {
-                if (!nativeLoadLibrary(libName, loadAddress, libInfo)) {
-                    String errorMessage = "Unable to load library: " + libName;
+                if (!nativeLoadLibrary(libFilename, loadAddress, libInfo)) {
+                    String errorMessage = "Unable to load library: " + libFilename;
                     Log.e(TAG, errorMessage);
                     throw new UnsatisfiedLinkError(errorMessage);
                 }
@@ -781,7 +763,7 @@ public class Linker {
                         Locale.US,
                         "%s_LIBRARY_ADDRESS: %s %x",
                         sInBrowserProcess ? "BROWSER" : "RENDERER",
-                        libName,
+                        libFilename,
                         libInfo.mLoadAddress));
             }
 
@@ -789,7 +771,7 @@ public class Linker {
                 // Create a new shared RELRO section at the 'current' fixed load address.
                 if (!nativeCreateSharedRelro(sharedRelRoName, sCurrentLoadAddress, libInfo)) {
                     Log.w(TAG, String.format(Locale.US,
-                            "Could not create shared RELRO for %s at %x", libName,
+                            "Could not create shared RELRO for %s at %x", libFilename,
                             sCurrentLoadAddress));
                 } else {
                     if (DEBUG) Log.i(TAG,
@@ -824,6 +806,16 @@ public class Linker {
     }
 
     /**
+     * Get the full library filename in zip file (lib/<abi>/crazy.<lib_name>).
+     *
+     * @param library The library's base name.
+     * @return the library filename (or empty string on failure).
+     */
+    public static String getLibraryFilenameInZipFile(String library) {
+        return nativeGetLibraryFilenameInZipFile(library);
+    }
+
+    /**
      * Check whether the device supports loading a library directly from the APK file.
      *
      * @param apkFile Filename of the APK.
@@ -959,6 +951,15 @@ public class Linker {
     private static native long nativeGetRandomBaseLoadAddress(long sizeBytes);
 
     /**
+      * Native method used to get the full library filename in zip file
+      * (lib/<abi>/crazy.<lib_name>).
+      *
+      * @param library The library's base name.
+      * @return the library filename (or empty string on failure).
+      */
+      private static native String nativeGetLibraryFilenameInZipFile(String library);
+
+    /**
      * Native method which checks whether the device supports loading a library
      * directly from the APK file.
      *