Avoid GPU readback in tex(Sub)Image2D(ImageBitmap)

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

Index: third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h
diff --git a/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h b/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h
index 001e3b01b93b3145e6792ca8fc9bc93c112ef843..a166152aa58541840bc7ccb36e22e6ecd685cbe4 100644
--- a/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h
+++ b/third_party/WebKit/Source/platform/graphics/StaticBitmapImage.h
@@ -7,9 +7,12 @@
 
 #include "platform/graphics/Image.h"
 #include "public/platform/WebExternalTextureMailbox.h"
+#include "third_party/khronos/GLES2/gl2.h"
 
 namespace blink {
 
+class WebGraphicsContext3DProvider;
+
 class PLATFORM_EXPORT StaticBitmapImage final : public Image {
 public:
     ~StaticBitmapImage() override;
@@ -29,10 +32,19 @@ public:
     void setOriginClean(bool flag) { m_isOriginClean = flag; }
     bool isPremultiplied() const { return m_isPremultiplied; }
     void setPremultiplied(bool flag) { m_isPremultiplied = flag; }
+    void copyToTexture(WebGraphicsContext3DProvider*, GLuint, GLenum, GLenum, bool);
+    bool isTextureBacked() override;
+    bool hasMailbox() { return m_mailbox.textureSize.width != 0 && m_mailbox.textureSize.height != 0; }
+
 protected:
     StaticBitmapImage(PassRefPtr<SkImage>);
     StaticBitmapImage(WebExternalTextureMailbox&);
 
+private:
+    GLuint switchStorageToSkImage(WebGraphicsContext3DProvider*);
+    bool switchStorageToMailbox(WebGraphicsContext3DProvider*);
+    GLuint textureIdForWebGL(WebGraphicsContext3DProvider*);
+
     RefPtr<SkImage> m_image;
     WebExternalTextureMailbox m_mailbox;
     bool m_isOriginClean = true;