NOT FOR REVIEW: Fullscreen WIP

third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp b/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
index afa1f2d411b8e988076e4f72f28dc65ed8b35ec3..cd07372d8b781c95be928e2b3197494467631b55 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
@@ -35,15 +35,19 @@
 #include "core/dom/ContainerNode.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
+#include "core/dom/Fullscreen.h"
+#include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
+#include "core/frame/VisualViewport.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLPlugInElement.h"
 #include "core/html/HTMLTableCellElement.h"
 #include "core/html/HTMLTextAreaElement.h"
 #include "core/layout/LayoutTheme.h"
+#include "core/page/Page.h"
 #include "core/style/ComputedStyle.h"
 #include "core/style/ComputedStyleConstants.h"
 #include "core/svg/SVGSVGElement.h"
@@ -403,6 +407,19 @@ void StyleAdjuster::adjustComputedStyle(ComputedStyle& style,
     // from inline.  https://drafts.csswg.org/css-containment/#containment-paint
     if (style.containsPaint() && style.display() == EDisplay::Inline)
       style.setDisplay(EDisplay::Block);
+
+    if (element && Fullscreen::isFullscreenElement(*element)) {
+      // We need to size the fullscreen element to the inner viewport and not to
+      // the outer viewport (what percentage would do). Unfortunately CSS can't
+      // handle that as we don't expose the inner viewport information.
+      //
+      // TODO(dsinclair): We should find a way to get this standardized.
+      // crbug.com/534924
+      IntSize viewportSize =
+          element->document().page()->frameHost().visualViewport().size();
+      style.setWidth(Length(viewportSize.width(), Fixed));
+      style.setHeight(Length(viewportSize.height(), Fixed));
+    }
   } else {
     adjustStyleForFirstLetter(style);
   }