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..8ce06ce24eb6ef7e80e79e284bdb262647884784
--- /dev/null
+++ b/content/shell/android/linker_test_apk/src/org/chromium/content_linker_test_apk/LinkerTests.java
@@ -0,0 +1,48 @@
+// 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) {
+        switch (memoryDeviceConfig) {
+            case Linker.MEMORY_DEVICE_CONFIG_LOW:
+                // On low-memory devices, shared RELROs are used in every process.
+                return nativeCheckForSharedRelros(isBrowserProcess);
+
+            case Linker.MEMORY_DEVICE_CONFIG_NORMAL:
+                // On regular devices, only service processes use a shared RELRO section.
+                if (isBrowserProcess)
+                    return nativeCheckForNoSharedRelros(isBrowserProcess);
+                else
+                    return nativeCheckForSharedRelros(isBrowserProcess);
+
+            default:
+                Log.e(TAG, "Invalid memory device configuration: " + memoryDeviceConfig);
+                return false;
+        }
+    }
+
+    // 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);
+
+}