Reland "Introduce mailbox-based version of VideoTextureBacking"

This is a reland of 0c93bcb5

This change depends on an earlier change that has been relanded.
https://chromium-review.googlesource.com/c/chromium/src/+/2634055
This one can now reland too.

Original change's description:
> Introduce mailbox-based version of VideoTextureBacking
>
> This CL introduces an OOPR compatible version of VideoTextureBacking and
> updates PaintCanvasVideoRenderer::UpdateLastImage() to use this new
> version in the OOPR codepath.
>
> More details about overall PaintImage effort: crbug.com/1023259
> Info about the OOPR-Canvas2D project: crbug.com/1018894
>
> Bug: 1115217
> Change-Id: I4590cf16d6faef0e5575b0b4006ea88de89aa13d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419653
> Reviewed-by: Khushal <khushalsagar@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Commit-Queue: Jonah Chin <jochin@microsoft.com>
> Cr-Commit-Position: refs/heads/master@{#826449}

Bug: 1115217
Change-Id: I7350332bad441440b69c7b472cbf08074a33304e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640815Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Jonah Chin <jochin@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#845358}

cc/paint/paint_image.cc

@@ -298,11 +298,6 @@ void PaintImage::FlushPendingSkiaOps() {
     texture_backing_->FlushPendingSkiaOps();
 }
 
-bool PaintImage::HasExclusiveTextureAccess() const {
-  DCHECK(IsTextureBacked());
-  return texture_backing_->unique();
-}
-
 int PaintImage::width() const {
   return paint_worklet_input_
              ? static_cast<int>(paint_worklet_input_->GetSize().width())

cc/paint/paint_image.h

@@ -239,10 +239,11 @@ class CC_PAINT_EXPORT PaintImage {
                   int src_x,
                   int src_y) const;
 
-  SkImageInfo GetSkImageInfo() const;
+  // Returned mailbox must not outlive this PaintImage.
+  gpu::Mailbox GetMailbox() const;
 
   Id stable_id() const { return id_; }
-  gpu::Mailbox GetMailbox() const;
+  SkImageInfo GetSkImageInfo() const;
   AnimationType animation_type() const { return animation_type_; }
   CompletionState completion_state() const { return completion_state_; }
   bool is_multipart() const { return is_multipart_; }
@@ -265,7 +266,6 @@ class CC_PAINT_EXPORT PaintImage {
   // Skia internally buffers commands and flushes them as necessary but there
   // are some cases where we need to force a flush.
   void FlushPendingSkiaOps();
-  bool HasExclusiveTextureAccess() const;
   int width() const;
   int height() const;
   SkColorSpace* color_space() const {

cc/paint/paint_op_buffer.cc

@@ -1475,9 +1475,14 @@ void DrawImageOp::RasterWithFlags(const DrawImageOp* op,
       canvas->scale(1.f / op->scale_adjustment.width(),
                     1.f / op->scale_adjustment.height());
     }
-    auto sk_image = op->image.IsTextureBacked()
-                        ? op->image.GetAcceleratedSkImage()
-                        : op->image.GetSwSkImage();
+    sk_sp<SkImage> sk_image;
+    if (op->image.IsTextureBacked()) {
+      sk_image = op->image.GetAcceleratedSkImage();
+      DCHECK(sk_image || !canvas->recordingContext());
+    }
+    if (!sk_image)
+      sk_image = op->image.GetSwSkImage();
+
     canvas->drawImage(sk_image.get(), op->left, op->top, &paint);
     return;
   }
@@ -1548,9 +1553,13 @@ void DrawImageRectOp::RasterWithFlags(const DrawImageRectOp* op,
   if (!params.image_provider) {
     SkRect adjusted_src = AdjustSrcRectForScale(op->src, op->scale_adjustment);
     flags->DrawToSk(canvas, [op, adjusted_src](SkCanvas* c, const SkPaint& p) {
-      auto sk_image = op->image.IsTextureBacked()
-                          ? op->image.GetAcceleratedSkImage()
-                          : op->image.GetSwSkImage();
+      sk_sp<SkImage> sk_image;
+      if (op->image.IsTextureBacked()) {
+        sk_image = op->image.GetAcceleratedSkImage();
+        DCHECK(sk_image || !c->recordingContext());
+      }
+      if (!sk_image)
+        sk_image = op->image.GetSwSkImage();
       c->drawImageRect(sk_image.get(), adjusted_src, op->dst, &p,
                        op->constraint);
     });

media/blink/webmediaplayer_impl.cc

@@ -1356,8 +1356,10 @@ void WebMediaPlayerImpl::Paint(cc::PaintCanvas* canvas,
   if (video_frame && video_frame->HasTextures()) {
     if (!raster_context_provider_)
       return;  // Unable to get/create a shared main thread context.
-    if (!raster_context_provider_->GrContext())
-      return;  // The context has been lost since and can't setup a GrContext.
+    if (!raster_context_provider_->GrContext() &&
+        !raster_context_provider_->ContextCapabilities().supports_oop_raster) {
+      return;  // The context has been lost.
+    }
   }
   if (out_metadata && video_frame) {
     // WebGL last-uploaded-frame-metadata API enabled. https://crbug.com/639174

media/renderers/paint_canvas_video_renderer.h

@@ -41,6 +41,7 @@ class RasterContextProvider;
 }
 
 namespace media {
+class VideoTextureBacking;
 
 // Handles rendering of VideoFrames to PaintCanvases.
 class MEDIA_EXPORT PaintCanvasVideoRenderer {
@@ -211,22 +212,15 @@ class MEDIA_EXPORT PaintCanvasVideoRenderer {
     // to the visible size of the VideoFrame. Its contents are generated lazily.
     cc::PaintImage paint_image;
 
-    // The context provider used to generate |source_mailbox| and
-    // |source_texture|. This is only set if the VideoFrame was texture-backed.
-    scoped_refptr<viz::RasterContextProvider> raster_context_provider;
-
-    // The mailbox for the source texture. This can be either the source
-    // VideoFrame's texture (if |wraps_video_frame_texture| is true) or a newly
-    // allocated shared image (if |wraps_video_frame_texture| is false) if a
-    // copy or conversion was necessary.
-    // This is only set if the VideoFrame was texture-backed.
-    gpu::Mailbox source_mailbox;
+    // The backing for the source texture. This is also responsible for managing
+    // the lifetime of the texture.
+    sk_sp<VideoTextureBacking> texture_backing;
 
-    // The texture ID created when importing |source_mailbox|.
+    // The GL texture ID used in non-OOP code path.
     // This is only set if the VideoFrame was texture-backed.
     uint32_t source_texture = 0;
 
-    // The allocated size of |source_mailbox|.
+    // The allocated size of VideoFrame texture.
     // This is only set if the VideoFrame was texture-backed.
     gfx::Size coded_size;
 
@@ -235,10 +229,6 @@ class MEDIA_EXPORT PaintCanvasVideoRenderer {
     // This is only set if the VideoFrame was texture-backed.
     gfx::Rect visible_rect;
 
-    // Whether |source_mailbox| directly points to a texture of the VideoFrame
-    // (if true), or to an allocated shared image (if false).
-    bool wraps_video_frame_texture = false;
-
     // Used to allow recycling of the previous shared image. This requires that
     // no external users have access to this resource via SkImage. Returns true
     // if the existing resource can be recycled.
@@ -266,6 +256,8 @@ class MEDIA_EXPORT PaintCanvasVideoRenderer {
       unsigned int type,
       bool flip_y);
 
+  bool CacheBackingWrapsTexture() const;
+
   base::Optional<Cache> cache_;
 
   // If |cache_| is not used for a while, it's deleted to save memory.

services/viz/public/cpp/gpu/context_provider_command_buffer.cc

@@ -377,8 +377,8 @@ gpu::ContextSupport* ContextProviderCommandBuffer::ContextSupport() {
 class GrDirectContext* ContextProviderCommandBuffer::GrContext() {
   DCHECK(bind_tried_);
   DCHECK_EQ(bind_result_, gpu::ContextResult::kSuccess);
-  DCHECK(support_grcontext_);
-  DCHECK(ContextSupport()->HasGrContextSupport());
+  if (!support_grcontext_ || !ContextSupport()->HasGrContextSupport())
+    return nullptr;
   CheckValidThreadOrLockAcquired();
 
   if (gr_context_)