[android_webview] Don't block the IO thread when reading from an InputStream.

This breaks up the functionality in the AndroidStreamReader..Job into
three separate classes, adds native unittests and makes the Job read
the InputStream on a background thread.
This change adds a separate unittestjava folder because the code under
javatests can't be compiled to be a part of a native unittest APK due to
resource dependencies.

TEST=AndroidWebviewTests,android_webview_unittests
BUG=None

Review URL: https://codereview.chromium.org/11363123

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@169274 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 40 insertions, 0 deletions

diff --git a/android_webview/unittestjava/src/org/chromium/android_webview/unittest/InputStreamUnittest.java b/android_webview/unittestjava/src/org/chromium/android_webview/unittest/InputStreamUnittest.java
new file mode 100644
index 0000000..3405017
--- /dev/null
+++ b/android_webview/unittestjava/src/org/chromium/android_webview/unittest/InputStreamUnittest.java
@@ -0,0 +1,40 @@
+// Copyright (c) 2012 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.android_webview.unittest;
+
+import org.chromium.base.CalledByNative;
+
+import java.io.InputStream;
+import java.io.IOException;
+
+class InputStreamUnittest {
+  private InputStreamUnittest() {
+  }
+
+  @CalledByNative
+  static InputStream getEmptyStream() {
+      return new InputStream() {
+          @Override
+          public int read() {
+              return -1;
+          }
+      };
+  }
+
+  @CalledByNative
+  static InputStream getCountingStream(final int size) {
+      return new InputStream() {
+          private int count = 0;
+
+          @Override
+          public int read() {
+              if (count < size)
+                  return count++ % 256;
+              else
+                  return -1;
+          }
+      };
+  }
+}