Make it possibe to lock the fixedLayoutSize

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 9989bd90b968a20702135c267f2ba8e00add46d7..94e3434810371ef58a0b7c78012558d37ff8d22d 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -379,6 +379,7 @@ WebViewImpl::WebViewImpl(WebViewClient* client)
     , m_editorClientImpl(this)
     , m_inspectorClientImpl(this)
     , m_backForwardClientImpl(this)
+    , m_forceFixedLayoutSizeToEqualSize(false)
     , m_shouldAutoResize(false)
     , m_observedNewNavigation(false)
 #ifndef NDEBUG
@@ -3009,7 +3010,8 @@ void WebViewImpl::updatePageDefinedPageScaleConstraints(const ViewportArguments&
     if (page()->settings().textAutosizingEnabled() && page()->mainFrame() && layoutSize.width != fixedLayoutSize().width)
         page()->mainFrame()->document()->textAutosizer()->recalculateMultipliers();
 
-    setFixedLayoutSize(layoutSize);
+    if (!m_shouldAutoResize)
+        setFixedLayoutSize(layoutSize);
 }
 
 IntSize WebViewImpl::contentsSize() const
@@ -3101,7 +3103,16 @@ void WebViewImpl::setFixedLayoutSize(const WebSize& layoutSize)
     if (!frame || !frame->view())
         return;
 
-    frame->view()->setFixedLayoutSize(layoutSize);
+    if (m_forceFixedLayoutSizeToEqualSize)
+        frame->view()->setFixedLayoutSize(m_size);
+    else
+        frame->view()->setFixedLayoutSize(layoutSize);
+
+}
+
+void WebViewImpl::setForceFixedLayoutSizeToEqualSize(bool value)
+{
+    m_forceFixedLayoutSizeToEqualSize = value;
 }
 
 void WebViewImpl::performMediaPlayerAction(const WebMediaPlayerAction& action,
@@ -3651,7 +3662,8 @@ void WebViewImpl::layoutUpdated(WebFrameImpl* webframe)
         WebSize frameSize = mainFrameImpl()->frame()->view()->frameRect().size();
         if (frameSize != m_size) {
             m_size = frameSize;
-            m_client->didAutoResize(m_size);
+            if (!m_forceFixedLayoutSizeToEqualSize)

[mkosiba (inactive), 2013/08/30 18:25:09]

the reason for this is that it causes RenderWidget to resize the compositor to
m_size * dipScale.

[aelias_OOO_until_Jul13, 2013/08/31 03:45:04]

Could you explain why that's wrong?  Is it because of page scale or something
else?

[mkosiba (inactive), 2013/09/02 11:28:58]

Page scale mostly. My concern is that this ends up overriding the
physical_backing_size
AwContents has previously set. Even if the RenderWidget factored in the
pageScale correctly
there could still rounding errors.
The AutoResize code was written with the assumption that the size of the popup
window can be
freely altered. This is not the case for webview.

+                m_client->didAutoResize(m_size);
             sendResizeEventAndRepaint();
         }
     }