Adds MemoryPressureListener.

base/android/java/src/org/chromium/base/MemoryPressureHandler.java

Index: base/android/java/src/org/chromium/base/MemoryPressureHandler.java
diff --git a/base/android/java/src/org/chromium/base/MemoryPressureHandler.java b/base/android/java/src/org/chromium/base/MemoryPressureHandler.java
new file mode 100644
index 0000000000000000000000000000000000000000..e12512c31dc1b2901d931fe82e48d9f852b12c92
--- /dev/null
+++ b/base/android/java/src/org/chromium/base/MemoryPressureHandler.java
@@ -0,0 +1,29 @@
+// 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.base;
+
+import android.content.ComponentCallbacks2;
+
+import org.chromium.base.MemoryPressureList;
+
+

[joth, 2013/06/05 16:51:23]

remove \n

[bulach, 2013/06/05 19:02:11]

Done.

+public class MemoryPressureHandler {

[joth, 2013/06/05 16:51:23]

private? Comment this is an internal impl. detail of the cc side?

[bulach, 2013/06/05 19:02:11]

Done.

+  public static void onMemoryPressure(int memoryPressureType) {

[joth, 2013/06/05 16:51:23]

Ah I see.

So, we can make this self-contained, no public function needed, by doing 
appContext.registerComponentCallbacks(an instance of CompontentCallbacks2)

GetApplicationContext() called on native side and passed over.

[bulach, 2013/06/05 19:02:11]

a-ha! good idea, I didn't know about this registration, certainly simplify
things. done.

+      nativeOnMemoryPressure(translate(memoryPressureType));
+  }
+
+  private static int translate(int memoryPressureType) {
+      if (memoryPressureType == ComponentCallbacks2.TRIM_MEMORY_RUNNING_LOW) {
+          return MemoryPressureList.MEMORY_PRESSURE_LOW;
+      } else if (memoryPressureType == ComponentCallbacks2.TRIM_MEMORY_RUNNING_MODERATE) {
+          return MemoryPressureList.MEMORY_PRESSURE_MODERATE;
+      } else if (memoryPressureType == ComponentCallbacks2.TRIM_MEMORY_RUNNING_CRITICAL) {
+          return MemoryPressureList.MEMORY_PRESSURE_CRITICAL;
+      }
+      return MemoryPressureList.MEMORY_PRESSURE_CRITICAL;
+  }
+
+  private static native void nativeOnMemoryPressure(int memoryPressureType);
+}