Add GetScrollOffset function to PPB_View

ppapi/tests/test_view.cc

 // Copyright (c) 2011 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.
 
 #include "ppapi/tests/test_view.h"
 
 #include <sstream>
 
 #include "ppapi/c/pp_time.h"
 #include "ppapi/c/private/ppb_testing_private.h"
@@ skipping 28 matching lines @@
 bool TestView::Init() {
   return CheckTestingInterface();
 }
 
 void TestView::RunTests(const std::string& filter) {
   RUN_TEST(CreatedVisible, filter);
   RUN_TEST(CreatedInvisible, filter);
   RUN_TEST(PageHideShow, filter);
   RUN_TEST(SizeChange, filter);
   RUN_TEST(ClipChange, filter);
+  RUN_TEST(ScrollOffsetChange, filter);
 }
 
 bool TestView::WaitUntilViewChanged() {
   // Schedule a callback so this step times out if we don't get a ViewChanged
   // in a reasonable amount of time.
   pp::CompletionCallbackFactory<TestView> factory(this);
   pp::CompletionCallback timeout =
       factory.NewCallback(&TestView::QuitMessageLoop);
   pp::Module::Get()->core()->CallOnMainThread(
       kViewChangeTimeoutSec * 1000, timeout);
@@ skipping 133 matching lines @@
   desired_clip.set_height(desired_clip.height() - desired_clip.y());
 
   PP_Time begin_time = pp::Module::Get()->core()->GetTime();
   while (WaitUntilViewChanged() && last_view_.GetClipRect() != desired_clip &&
          pp::Module::Get()->core()->GetTime() - begin_time <
              kViewChangeTimeoutSec) {
   }
   ASSERT_TRUE(last_view_.GetClipRect() == desired_clip);
   PASS();
 }
+
+std::string TestView::TestScrollOffsetChange() {
+  instance_->EvalScript("document.body.style.width = '5000px';"
+                        "document.body.style.height = '5000px';");
+  instance_->EvalScript("window.scrollTo(5, 1);");
+
+  PP_Time begin_time = pp::Module::Get()->core()->GetTime();
+  while (WaitUntilViewChanged() &&
+         last_view_.GetScrollOffset() != pp::Point(5, 1) &&
+         pp::Module::Get()->core()->GetTime() - begin_time <
+             kViewChangeTimeoutSec) {
+  }
+  ASSERT_EQ(pp::Point(5, 1), last_view_.GetScrollOffset());
+
+  instance_->EvalScript("window.scrollTo(0, 0);");
+
+  begin_time = pp::Module::Get()->core()->GetTime();
+  while (WaitUntilViewChanged() &&
+         last_view_.GetScrollOffset() != pp::Point(0, 0) &&
+         pp::Module::Get()->core()->GetTime() - begin_time <
+             kViewChangeTimeoutSec) {
+  }
+  ASSERT_EQ(pp::Point(0, 0), last_view_.GetScrollOffset());
+
+  PASS();
+}