Make panel adjust bounds per preferred size change notification on Windows.

chrome/browser/ui/panels/panel_browser_view_browsertest.cc

Index: chrome/browser/ui/panels/panel_browser_view_browsertest.cc
===================================================================
--- chrome/browser/ui/panels/panel_browser_view_browsertest.cc	(revision 98900)
+++ chrome/browser/ui/panels/panel_browser_view_browsertest.cc	(working copy)
@@ -13,10 +13,13 @@
 #include "chrome/browser/ui/panels/panel_browser_view.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
 #include "chrome/browser/ui/panels/panel_mouse_watcher_win.h"
+#include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
+#include "chrome/test/base/ui_test_utils.h"
 #include "grit/generated_resources.h"
+#include "net/base/net_util.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/animation/slide_animation.h"
@@ -27,6 +30,9 @@
 #include "views/controls/link.h"
 #include "views/controls/textfield/textfield.h"
 
+const FilePath::CharType* kUpdateSizeTestFile =
+    FILE_PATH_LITERAL("update-preferred-size.html");
+
 class PanelBrowserViewTest : public BasePanelBrowserTest {
  public:
   PanelBrowserViewTest() : BasePanelBrowserTest() { }
@@ -386,6 +392,57 @@
 
     panel->Close();
   }
+
+  void TestUpdatePreferredSize() {
+    PanelManager::GetInstance()->enable_auto_sizing(true);
+
+    // Create a test panel with tab contents loaded.
+    CreatePanelParams params("PanelTest1", gfx::Rect(0, 0, 100, 100),
+                             SHOW_AS_ACTIVE);
+    params.url = GURL(chrome::kAboutBlankURL);
+    Panel* panel = CreatePanelWithParams(params);
+
+    // Load the test page.
+    ui_test_utils::NavigateToURL(panel->browser(),
+        ui_test_utils::GetTestUrl(FilePath(FilePath::kCurrentDirectory),
+                                  FilePath(kUpdateSizeTestFile)));
+    gfx::Rect initial_bounds = panel->GetBounds();
+    EXPECT_EQ(100, initial_bounds.width());
+    EXPECT_EQ(100, initial_bounds.height());
+
+    // Expand the test page.
+    EXPECT_TRUE(ui_test_utils::ExecuteJavaScript(
+        panel->browser()->GetSelectedTabContents()->render_view_host(),
+        std::wstring(),
+        L"changeSize(50);"));
+
+    // Wait till the bounds get changed.
+    gfx::Rect bounds_on_grow;
+    while ((bounds_on_grow = panel->GetBounds()) == initial_bounds) {
+      MessageLoop::current()->PostTask(FROM_HERE, new MessageLoop::QuitTask());
+      MessageLoop::current()->RunAllPending();
+    }
+    EXPECT_GT(bounds_on_grow.width(), initial_bounds.width());
+    EXPECT_EQ(bounds_on_grow.height(), initial_bounds.height());
+
+    // Shrink the test page.
+    EXPECT_TRUE(ui_test_utils::ExecuteJavaScript(
+        panel->browser()->GetSelectedTabContents()->render_view_host(),
+        std::wstring(),
+        L"changeSize(-30);"));
+
+    // Wait till the bounds get changed.
+    gfx::Rect bounds_on_shrink;
+    while ((bounds_on_shrink = panel->GetBounds()) == bounds_on_grow) {
+      MessageLoop::current()->PostTask(FROM_HERE, new MessageLoop::QuitTask());
+      MessageLoop::current()->RunAllPending();
+    }
+    EXPECT_LT(bounds_on_shrink.width(), bounds_on_grow.width());
+    EXPECT_GT(bounds_on_shrink.width(), initial_bounds.width());
+    EXPECT_EQ(bounds_on_shrink.height(), initial_bounds.height());
+
+    panel->Close();
+  }
 };
 
 // Panel is not supported for Linux view yet.
@@ -534,4 +591,8 @@
 IN_PROC_BROWSER_TEST_F(PanelBrowserViewTest, ChangeAutoHideTaskBarThickness) {
   TestChangeAutoHideTaskBarThickness();
 }
+
+IN_PROC_BROWSER_TEST_F(PanelBrowserViewTest, UpdatePreferredSize) {
+  TestUpdatePreferredSize();
+}
 #endif