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 1b81bb3b60dae24db2760fa58dd1ce78d928b28c..d23480e13d8089f0e34e961065ac7d9bfe24d96a 100644
--- a/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurface.cpp
+++ b/third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurface.cpp
@@ -228,7 +228,6 @@ sk_sp<PaintRecord> RecordingImageBufferSurface::getPicture() {
 
   FallbackReason fallbackReason = FallbackReasonUnknown;
   bool canUsePicture = finalizeFrameInternal(&fallbackReason);
-  m_imageBuffer->didFinalizeFrame();
 
   ASSERT(canUsePicture || m_fallbackFactory);
 
@@ -241,9 +240,9 @@ sk_sp<PaintRecord> RecordingImageBufferSurface::getPicture() {
   return nullptr;
 }
 
-void RecordingImageBufferSurface::finalizeFrame(const FloatRect& dirtyRect) {
+void RecordingImageBufferSurface::finalizeFrame() {
   if (m_fallbackSurface) {
-    m_fallbackSurface->finalizeFrame(dirtyRect);
+    m_fallbackSurface->finalizeFrame();
     return;
   }
 
@@ -252,6 +251,14 @@ void RecordingImageBufferSurface::finalizeFrame(const FloatRect& dirtyRect) {
     fallBackToRasterCanvas(fallbackReason);
 }
 
+void RecordingImageBufferSurface::doPaintInvalidation(
+    const FloatRect& dirtyRect) {
+  if (m_fallbackSurface) {
+    m_fallbackSurface->doPaintInvalidation(dirtyRect);
+    return;

[xlai (Olivia), 2017/02/08 17:58:40]

no need "return".

[Justin Novosad, 2017/02/08 18:43:12]

Done.

+  }
+}
+
 static RecordingImageBufferSurface::FallbackReason flushReasonToFallbackReason(
     FlushReason reason) {
   switch (reason) {
@@ -298,8 +305,7 @@ bool RecordingImageBufferSurface::finalizeFrameInternal(
   ASSERT(m_currentFrame->getRecordingCanvas());
   ASSERT(fallbackReason);
   ASSERT(*fallbackReason == FallbackReasonUnknown);
-
-  if (!m_imageBuffer->isDirty()) {
+  if (!m_didRecordDrawCommandsInCurrentFrame) {
     if (!m_previousFrame) {
       // Create an initial blank frame
       m_previousFrame = m_currentFrame->finishRecordingAsPicture();