DevTools: Add feature to capture full-height screenshots

third_party/WebKit/Source/core/inspector/InspectorPageAgent.cpp

Index: third_party/WebKit/Source/core/inspector/InspectorPageAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorPageAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorPageAgent.cpp
index f75a8df4027e28791a8e2ae110383ea6f2912055..61002f2d5695c140144cb16fc3902241fc09c96d 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorPageAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorPageAgent.cpp
@@ -846,7 +846,8 @@ Response InspectorPageAgent::configureOverlay(Maybe<bool> suspended,
 
 Response InspectorPageAgent::getLayoutMetrics(
     std::unique_ptr<protocol::Page::LayoutViewport>* outLayoutViewport,
-    std::unique_ptr<protocol::Page::VisualViewport>* outVisualViewport) {
+    std::unique_ptr<protocol::Page::VisualViewport>* outVisualViewport,
+    std::unique_ptr<protocol::DOM::Rect>* outContentSize) {
   LocalFrame* mainFrame = m_inspectedFrames->root();
   VisualViewport& visualViewport = mainFrame->host()->visualViewport();
 
@@ -868,6 +869,14 @@ Response InspectorPageAgent::getLayoutMetrics(
   float scrollbarWidth = frameView->verticalScrollbarWidth() / scale;
   float scrollbarHeight = frameView->horizontalScrollbarHeight() / scale;
 
+  IntSize  contentSize = frameView->getScrollableArea()->contentsSize();
+  *outContentSize = protocol::DOM::Rect::create()
+                        .setX(0)
+                        .setY(0)
+                        .setWidth(contentSize.width())
+                        .setHeight(contentSize.height())
+                        .build();
+
   *outVisualViewport =
       protocol::Page::VisualViewport::create()
           .setOffsetX(adjustScrollForAbsoluteZoom(visibleRect.x(), pageZoom))