Android: Add chrome-specific dynamic linker.

content/shell/android/linker_test_apk/src/org/chromium/content_linker_test_apk/LinkerTests.java

Index: content/shell/android/linker_test_apk/src/org/chromium/content_linker_test_apk/LinkerTests.java
diff --git a/content/shell/android/linker_test_apk/src/org/chromium/content_linker_test_apk/LinkerTests.java b/content/shell/android/linker_test_apk/src/org/chromium/content_linker_test_apk/LinkerTests.java
new file mode 100644
index 0000000000000000000000000000000000000000..4247b903f5789de9854edf89db45d4d632c68c37
--- /dev/null
+++ b/content/shell/android/linker_test_apk/src/org/chromium/content_linker_test_apk/LinkerTests.java
@@ -0,0 +1,61 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.content_linker_test_apk;
+
+import android.util.Log;
+
+import org.chromium.base.JNINamespace;
+import org.chromium.content.app.Linker;
+
+// A class that is only used in linker test APK to perform runtime checks
+// in the current process.
+@JNINamespace("content")
+public class LinkerTests implements Linker.TestRunner {
+    private static final String TAG = "LinkerTests";
+
+    public LinkerTests() {}
+
+    public boolean runChecks(int memoryDeviceConfig,
+                             boolean isBrowserProcess) {
+        boolean checkSharedRelro;
+        if (isBrowserProcess) {
+            switch (Linker.BROWSER_SHARED_RELRO_CONFIG) {
+                case Linker.BROWSER_SHARED_RELRO_CONFIG_NEVER:
+                    checkSharedRelro = false;
+                    break;
+                case Linker.BROWSER_SHARED_RELRO_CONFIG_LOW_RAM_ONLY:
+                    // A shared RELRO should only be used on low-end devices.
+                    checkSharedRelro =
+                            (memoryDeviceConfig == Linker.MEMORY_DEVICE_CONFIG_LOW);
+                    break;
+                case Linker.BROWSER_SHARED_RELRO_CONFIG_ALWAYS:
+                    // Always check for a shared RELRO.
+                    checkSharedRelro = true;
+                    break;
+                default:
+                    Log.e(TAG, "Invalid shared RELRO linker configuration: " +
+                          Linker.BROWSER_SHARED_RELRO_CONFIG);
+                    return false;
+            }
+        } else {
+          // Service processes should always use a shared RELRO section.
+          checkSharedRelro = true;
+        }
+
+        if (checkSharedRelro)
+            return nativeCheckForSharedRelros(isBrowserProcess);
+        else
+            return nativeCheckForNoSharedRelros(isBrowserProcess);
+    }
+
+    // Check that there are shared RELRO sections in the current process,
+    // and that they are properly mapped read-only. Returns true on success.
+    private static native boolean nativeCheckForSharedRelros(boolean isBrowserProcess);
+
+    // Check that there are no shared RELRO sections in the current process,
+    // return true on success.
+    private static native boolean nativeCheckForNoSharedRelros(boolean isBrowserProcess);
+
+}