Make stream captures work on canvases that are not in the DOM.

third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurface.cpp

Index: third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurface.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurface.cpp b/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurface.cpp
index 2afaaeebe4be604d88d030246bddc9c0def90ffd..8e56c8cbbc3773f9a79283f8e1c7c272ebca019d 100644
--- a/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurface.cpp
+++ b/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurface.cpp
@@ -229,7 +229,6 @@ sk_sp<PaintRecord> RecordingImageBufferSurface::getRecord() {
 
   FallbackReason fallbackReason = FallbackReasonUnknown;
   bool canUseRecord = finalizeFrameInternal(&fallbackReason);
-  m_imageBuffer->didFinalizeFrame();
 
   DCHECK(canUseRecord || m_fallbackFactory);
 
@@ -242,9 +241,9 @@ sk_sp<PaintRecord> RecordingImageBufferSurface::getRecord() {
   return nullptr;
 }
 
-void RecordingImageBufferSurface::finalizeFrame(const FloatRect& dirtyRect) {
+void RecordingImageBufferSurface::finalizeFrame() {
   if (m_fallbackSurface) {
-    m_fallbackSurface->finalizeFrame(dirtyRect);
+    m_fallbackSurface->finalizeFrame();
     return;
   }
 
@@ -253,6 +252,13 @@ void RecordingImageBufferSurface::finalizeFrame(const FloatRect& dirtyRect) {
     fallBackToRasterCanvas(fallbackReason);
 }
 
+void RecordingImageBufferSurface::doPaintInvalidation(
+    const FloatRect& dirtyRect) {
+  if (m_fallbackSurface) {
+    m_fallbackSurface->doPaintInvalidation(dirtyRect);
+  }
+}
+
 static RecordingImageBufferSurface::FallbackReason flushReasonToFallbackReason(
     FlushReason reason) {
   switch (reason) {
@@ -298,9 +304,8 @@ bool RecordingImageBufferSurface::finalizeFrameInternal(
   CHECK(m_currentFrame);
   DCHECK(m_currentFrame->getRecordingCanvas());
   DCHECK(fallbackReason);
-  DCHECK_EQ(*fallbackReason, FallbackReasonUnknown);
-
-  if (!m_imageBuffer->isDirty()) {
+  DCHECK(*fallbackReason == FallbackReasonUnknown);
+  if (!m_didRecordDrawCommandsInCurrentFrame) {
     if (!m_previousFrame) {
       // Create an initial blank frame
       m_previousFrame = m_currentFrame->finishRecordingAsPicture();