Android: adds test intents for memory pressure.

Allows using:
adb shell am start -a org.chromium.content_shell.action.ACTION_LOW_MEMORY \
-n org.chromium.content_shell_apk/.ContentShellActivity

to simulate memory pressure signals.

BUG=

Review URL: https://chromiumcodereview.appspot.com/17108012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207960 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -16,7 +16,7 @@ import org.chromium.base.MemoryPressureLevelList;
  * It registers a ComponentCallbacks2 with the system, and dispatches into
  * native.
  */
-class MemoryPressureListener {
+public class MemoryPressureListener {
   @CalledByNative
   private static void registerSystemCallback(Context context) {
       context.registerComponentCallbacks(
@@ -37,6 +37,13 @@ class MemoryPressureListener {
           });
   }
 
+  /**
+   * Used by applications to simulate a memory pressure signal.
+   */
+  public static void simulateMemoryPressureSignal(int level) {
+      nativeOnMemoryPressure(translate(level));
+  }
+
   private static int translate(int level) {
       if (level == ComponentCallbacks2.TRIM_MEMORY_COMPLETE) {
           return MemoryPressureLevelList.MEMORY_PRESSURE_CRITICAL;

chrome/android/testshell/java/src/org/chromium/chrome/testshell/ChromiumTestShellActivity.java

@@ -12,6 +12,7 @@ import android.util.Log;
 import android.view.KeyEvent;
 
 import org.chromium.base.ChromiumActivity;
+import org.chromium.base.MemoryPressureListener;
 import org.chromium.chrome.browser.DevToolsServer;
 import org.chromium.content.browser.ActivityContentVideoViewClient;
 import org.chromium.content.browser.AndroidBrowserProcess;
@@ -31,6 +32,19 @@ public class ChromiumTestShellActivity extends ChromiumActivity {
     private static final String TAG = ChromiumTestShellActivity.class.getCanonicalName();
     private static final String COMMAND_LINE_FILE =
             "/data/local/tmp/chromium-testshell-command-line";
+    /**
+     * Sending an intent with this action will simulate a memory pressure signal
+     * at a critical level.
+     */
+    private static final String ACTION_LOW_MEMORY =
+            "org.chromium.chrome_test_shell.action.ACTION_LOW_MEMORY";
+
+    /**
+     * Sending an intent with this action will simulate a memory pressure signal
+     * at a moderate level.
+     */
+    private static final String ACTION_TRIM_MEMORY_MODERATE =
+            "org.chromium.chrome_test_shell.action.ACTION_TRIM_MEMORY_MODERATE";
 
     private WindowAndroid mWindow;
     private TabManager mTabManager;
@@ -94,6 +108,14 @@ public class ChromiumTestShellActivity extends ChromiumActivity {
 
     @Override
     protected void onNewIntent(Intent intent) {
+        if (ACTION_LOW_MEMORY.equals(intent.getAction())) {
+            MemoryPressureListener.simulateMemoryPressureSignal(TRIM_MEMORY_COMPLETE);
+            return;
+        } else if (ACTION_TRIM_MEMORY_MODERATE.equals(intent.getAction())) {
+            MemoryPressureListener.simulateMemoryPressureSignal(TRIM_MEMORY_MODERATE);
+            return;
+        }
+
         String url = getUrlFromIntent(intent);
         if (!TextUtils.isEmpty(url)) {
             TestShellTab tab = getActiveTab();

content/shell/android/shell_apk/src/org/chromium/content_shell_apk/ContentShellActivity.java

@@ -14,6 +14,7 @@ import android.util.Log;
 import android.view.KeyEvent;
 
 import org.chromium.base.ChromiumActivity;
+import org.chromium.base.MemoryPressureListener;
 import org.chromium.content.app.LibraryLoader;
 import org.chromium.content.browser.ActivityContentVideoViewClient;
 import org.chromium.content.browser.AndroidBrowserProcess;
@@ -44,6 +45,21 @@ public class ContentShellActivity extends ChromiumActivity {
             "org.chromium.content_shell.action.PROFILE_STOP";
     public static final String COMMAND_LINE_ARGS_KEY = "commandLineArgs";
 
+    /**
+     * Sending an intent with this action will simulate a memory pressure signal
+     * at a critical level.
+     */
+    private static final String ACTION_LOW_MEMORY =
+            "org.chromium.content_shell.action.ACTION_LOW_MEMORY";
+
+    /**
+     * Sending an intent with this action will simulate a memory pressure signal
+     * at a moderate level.
+     */
+    private static final String ACTION_TRIM_MEMORY_MODERATE =
+            "org.chromium.content_shell.action.ACTION_TRIM_MEMORY_MODERATE";
+
+
     private ShellManager mShellManager;
     private WindowAndroid mWindowAndroid;
     private BroadcastReceiver mReceiver;
@@ -134,6 +150,14 @@ public class ContentShellActivity extends ChromiumActivity {
             Log.i(TAG, "Ignoring command line params: can only be set when creating the activity.");
         }
 
+        if (ACTION_LOW_MEMORY.equals(intent.getAction())) {
+            MemoryPressureListener.simulateMemoryPressureSignal(TRIM_MEMORY_COMPLETE);
+            return;
+        } else if (ACTION_TRIM_MEMORY_MODERATE.equals(intent.getAction())) {
+            MemoryPressureListener.simulateMemoryPressureSignal(TRIM_MEMORY_MODERATE);
+            return;
+        }
+
         String url = getUrlFromIntent(intent);
         if (!TextUtils.isEmpty(url)) {
             Shell activeView = getActiveShell();