Add Garbage collection test for AwContents

This is to ensure instances do not get leaked after GC, even if
AwContents.destroy() is not called.
This is a resurrection of the test in
https://codereview.chromium.org/12658010/diff/23001/android_webview/javatests/src/org/chromium/android_webview/test/AwContentsTest.java
now that crbug.com/197020 is no longer an issue (due to new graphics pipeline)

BUG=197020

Review URL: https://chromiumcodereview.appspot.com/16983009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207464 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 41 insertions, 0 deletions

diff --git a/android_webview/javatests/src/org/chromium/android_webview/test/AwContentsTest.java b/android_webview/javatests/src/org/chromium/android_webview/test/AwContentsTest.java
index 8e16a92..455d30b 100644
--- a/android_webview/javatests/src/org/chromium/android_webview/test/AwContentsTest.java
+++ b/android_webview/javatests/src/org/chromium/android_webview/test/AwContentsTest.java
@@ -24,6 +24,7 @@ import org.chromium.net.test.util.TestWebServer;
 import java.io.InputStream;
 import java.net.URL;
 import java.util.ArrayList;
+import java.util.concurrent.Callable;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.Callable;
 import java.util.concurrent.Semaphore;
@@ -154,6 +155,46 @@ public class AwContentsTest extends AwTestBase {
         }
     }
 
+    public void testCreateAndGcManyTimes() throws Throwable {
+        final int CONCURRENT_INSTANCES = 4;
+        final int REPETITIONS = 16;
+        // The system retains a strong ref to the last focused view (in InputMethodManager)
+        // so allow for 1 'leaked' instance.
+        final int MAX_IDLE_INSTANCES = 1;
+
+        System.gc();
+
+        assertTrue(pollOnUiThread(new Callable<Boolean>() {
+            @Override
+            public Boolean call() {
+                return AwContents.getNativeInstanceCount() <= MAX_IDLE_INSTANCES;
+            }
+        }));
+        for (int i = 0; i < REPETITIONS; ++i) {
+            for (int j = 0; j < CONCURRENT_INSTANCES; ++j) {
+                AwTestContainerView view = createAwTestContainerViewOnMainSync(mContentsClient);
+                loadUrlAsync(view.getAwContents(), "about:blank");
+            }
+            assertTrue(AwContents.getNativeInstanceCount() >= CONCURRENT_INSTANCES);
+            assertTrue(AwContents.getNativeInstanceCount() <= (i + 1) * CONCURRENT_INSTANCES);
+            runTestOnUiThread(new Runnable() {
+                @Override
+                public void run() {
+                    getActivity().removeAllViews();
+                }
+            });
+        }
+
+        System.gc();
+
+        assertTrue(pollOnUiThread(new Callable<Boolean>() {
+            @Override
+            public Boolean call() {
+                return AwContents.getNativeInstanceCount() <= MAX_IDLE_INSTANCES;
+            }
+        }));
+    }
+
     private int callDocumentHasImagesSync(final AwContents awContents)
             throws Throwable, InterruptedException {
         // Set up a container to hold the result object and a semaphore to