paint: Introduce PaintImage that wraps SkImage in paint calls.

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

Index: third_party/WebKit/Source/platform/graphics/StaticBitmapImage.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.cpp b/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.cpp
index 0ff71704405a5f5f9a62075c1b0161e2d3e7f6ac..4e9bd685c154dc2c69b912222e5e614d88d32365 100644
--- a/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.cpp
+++ b/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.cpp
@@ -8,6 +8,7 @@
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageObserver.h"
 #include "platform/graphics/UnacceleratedStaticBitmapImage.h"
+#include "platform/graphics/paint/PaintImage.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkPaint.h"
@@ -35,8 +36,15 @@ void StaticBitmapImage::DrawHelper(PaintCanvas* canvas,
   if (dst_rect.IsEmpty() || adjusted_src_rect.IsEmpty())
     return;  // Nothing to draw.
 
-  canvas->drawImageRect(std::move(image), adjusted_src_rect, dst_rect, &flags,
-                        WebCoreClampingModeToSkiaRectConstraint(clamp_mode));
+  auto animation_type = MaybeAnimated() ? PaintImage::AnimationType::ANIMATED

[pdr., 2017/04/12 17:37:05]

WDYT of just changing the return type of MaybeAnimated and
CurrentFrameIsComplete to be your new enums?

[vmpstr, 2017/04/12 18:58:44]

Hmm, there are callers outside of graphics that use this (like LayoutBox) and I
think the PaintImage guts should remain limited to graphics.. So I would prefer
to leave that as is. WDYT?

+                                        : PaintImage::AnimationType::STATIC;
+  auto completion_state = CurrentFrameIsComplete()
+                              ? PaintImage::CompletionState::DONE
+                              : PaintImage::CompletionState::PARTIALLY_DONE;
+  canvas->drawImageRect(
+      PaintImage(std::move(image), animation_type, completion_state),
+      adjusted_src_rect, dst_rect, &flags,
+      WebCoreClampingModeToSkiaRectConstraint(clamp_mode));
 }
 
 }  // namespace blink