Android: Add chrome-specific dynamic linker.

content/public/android/java/src/org/chromium/content/app/LibraryLoader.java

Index: content/public/android/java/src/org/chromium/content/app/LibraryLoader.java
diff --git a/content/public/android/java/src/org/chromium/content/app/LibraryLoader.java b/content/public/android/java/src/org/chromium/content/app/LibraryLoader.java
index bf64b4feae831154cf77918067be6c29bd07b67b..60f73d7953c118288e7b0e13b091d9e7b5bf73c7 100644
--- a/content/public/android/java/src/org/chromium/content/app/LibraryLoader.java
+++ b/content/public/android/java/src/org/chromium/content/app/LibraryLoader.java
@@ -8,6 +8,7 @@ import android.text.TextUtils;
 import android.util.Log;
 
 import org.chromium.base.JNINamespace;
+import org.chromium.base.SysUtils;
 import org.chromium.content.common.CommandLine;
 import org.chromium.content.common.ProcessInitException;
 import org.chromium.content.common.ResultCodes;
@@ -108,11 +109,28 @@ public class LibraryLoader {
         try {
             if (!sLoaded) {
                 assert !sInitialized;
-                for (String sLibrary : NativeLibraries.libraries) {
-                    Log.i(TAG, "loading: " + sLibrary);
-                    System.loadLibrary(sLibrary);
-                    Log.i(TAG, "loaded: " + sLibrary);
+
+                long startTime = System.currentTimeMillis();
+                boolean useChromeLinker = Linker.isUsed();
+
+                if (useChromeLinker)
+                    Linker.prepareLibraryLoad();
+
+                for (String library : NativeLibraries.libraries) {
+                    Log.i(TAG, "Loading: " + library);
+                    if (useChromeLinker) {
+                        Linker.loadLibrary(library);
+                    } else if (!library.equals("chrome_linker")) {
+                        System.loadLibrary(library);
+                    }
                 }
+                if (useChromeLinker)
+                    Linker.finishLibraryLoad();
+                long stopTime = System.currentTimeMillis();
+                Log.i(TAG, String.format("Time to load native libraries: %d ms (timestamps %d-%d)",
+                                         stopTime - startTime,
+                                         startTime % 10000,
+                                         stopTime % 10000));
                 sLoaded = true;
             }
         } catch (UnsatisfiedLinkError e) {
@@ -138,6 +156,10 @@ public class LibraryLoader {
         sInitialized = true;
         CommandLine.enableNativeProxy();
         TraceEvent.setEnabledToMatchNative();
+        // Record histogram for chrome linker.
+        if (Linker.isUsed())
+          nativeRecordContentAndroidLinkerHistogram(Linker.loadAtFixedAddressFailed(),
+                                                    SysUtils.isLowEndDevice());
     }
 
     // This is the only method that is registered during System.loadLibrary. We then call it
@@ -148,4 +170,10 @@ public class LibraryLoader {
     // Return 0 on success, otherwise return the error code from
     // content/public/common/result_codes.h.
     private static native int nativeLibraryLoaded(String[] initCommandLine);
+
+    // Method called to register if the chrome linker was able to load library at a fixed address.
+    // This is called once the library loading is done and successful.
+    private static native void nativeRecordContentAndroidLinkerHistogram(
+         boolean loadedAtFixedAddressFailed,
+         boolean isLowMemoryDevice);
 }