Revert of Revert of Carry out a resize even if no layout has been performed.

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 9d314fb083d8c013b0979c995412fab2c297abae..c4553267a604f402441d7979295d69c9399c70b8 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -1693,6 +1693,11 @@
     if (pinchVirtualViewportEnabled())
         page()->frameHost().pinchViewport().setSize(m_size);
 
+    if (mainFrameImpl()->frameView()) {
+        if (!mainFrameImpl()->frameView()->needsLayout())
+            postLayoutResize(mainFrameImpl());
+    }
+
     // When device emulation is enabled, device size values may change - they are
     // usually set equal to the view size. These values are not considered viewport-dependent
     // (see MediaQueryExp::isViewportDependent), since they are only viewport-dependent in emulation mode,
@@ -4013,33 +4018,9 @@
     }
 }
 
-void WebViewImpl::layoutUpdated(WebLocalFrameImpl* webframe)
-{
-    if (!m_client || !webframe->frame()->isLocalRoot())
-        return;
-
-    // If we finished a layout while in deferred commit mode,
-    // that means it's time to start producing frames again so un-defer.
-    resumeTreeViewCommits();
-
-    if (m_shouldAutoResize && webframe->frame() && webframe->frame()->view()) {
-        WebSize frameSize = webframe->frame()->view()->frameRect().size();
-        if (frameSize != m_size) {
-            m_size = frameSize;
-
-            page()->frameHost().pinchViewport().setSize(m_size);
-            m_pageScaleConstraintsSet.didChangeViewSize(m_size);
-
-            m_client->didAutoResize(m_size);
-            sendResizeEventAndRepaint();
-        }
-    }
-
-    if (m_pageScaleConstraintsSet.constraintsDirty())
-        refreshPageScaleFactorAfterLayout();
-
+void WebViewImpl::postLayoutResize(WebLocalFrameImpl* webframe)
+{
     FrameView* view = webframe->frame()->view();
-
     if (pinchVirtualViewportEnabled()) {
         if (webframe == mainFrame()) {
             view->resize(mainFrameSize());
@@ -4047,6 +4028,36 @@
             view->resize(webframe->frameView()->layoutSize());
         }
     }
+}
+
+void WebViewImpl::layoutUpdated(WebLocalFrameImpl* webframe)
+{
+    if (!m_client || !webframe->frame()->isLocalRoot())
+        return;
+
+    // If we finished a layout while in deferred commit mode,
+    // that means it's time to start producing frames again so un-defer.
+    resumeTreeViewCommits();
+
+    if (m_shouldAutoResize && webframe->frame() && webframe->frame()->view()) {
+        WebSize frameSize = webframe->frame()->view()->frameRect().size();
+        if (frameSize != m_size) {
+            m_size = frameSize;
+
+            page()->frameHost().pinchViewport().setSize(m_size);
+            m_pageScaleConstraintsSet.didChangeViewSize(m_size);
+
+            m_client->didAutoResize(m_size);
+            sendResizeEventAndRepaint();
+        }
+    }
+
+    if (m_pageScaleConstraintsSet.constraintsDirty())
+        refreshPageScaleFactorAfterLayout();
+
+    FrameView* view = webframe->frame()->view();
+
+    postLayoutResize(webframe);
 
     // Relayout immediately to avoid violating the rule that needsLayout()
     // isn't set at the end of a layout.