Remove use of DeferredTextureImageData APIs and Support Decode to Scale

We aren't benefitting from the complexity added by the
DeferredTextureImageData APIs, and this API blocks us from using
PaintImage::Decode's decode-to-scale functionality.

This change removes our usage of DeferredTextureImageData APIs,
instead using SkImage::makeTextureImage to handle upload. Additionally,
we now use the PaintImage::Decode API, adding decode-to-scale support.

Bug: 773799
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ia5f480213c3a5c8225ccd289aa2c081056840f94
Reviewed-on: https://chromium-review.googlesource.com/713593Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517206}

cc/tiles/gpu_image_decode_cache.h

@@ -203,9 +203,14 @@ class CC_EXPORT GpuImageDecodeCache
     void Unlock();
 
     void SetLockedData(std::unique_ptr<base::DiscardableMemory> data,
+                       sk_sp<SkImage> image,
                        bool out_of_raster);
     void ResetData();
     base::DiscardableMemory* data() const { return data_.get(); }
+    sk_sp<SkImage> image() const {
+      DCHECK(is_locked());
+      return image_;
+    }
 
     bool decode_failure = false;
     // Similar to |task|, but only is generated if there is no associated upload
@@ -216,6 +221,7 @@ class CC_EXPORT GpuImageDecodeCache
     void ReportUsageStats() const;
 
     std::unique_ptr<base::DiscardableMemory> data_;
+    sk_sp<SkImage> image_;
   };
 
   // Stores the GPU-side image and supporting fields.
@@ -243,13 +249,15 @@ class CC_EXPORT GpuImageDecodeCache
     ImageData(DecodedDataMode mode,
               size_t size,
               const gfx::ColorSpace& target_color_space,
-              const SkImage::DeferredTextureImageUsageParams& upload_params);
+              SkFilterQuality quality,
+              int mip_level);
 
     const DecodedDataMode mode;
     const size_t size;
     gfx::ColorSpace target_color_space;
+    SkFilterQuality quality;
+    int mip_level;
     bool is_at_raster = false;
-    SkImage::DeferredTextureImageUsageParams upload_params;
 
     // If true, this image is no longer in our |persistent_cache_| and will be
     // deleted as soon as its ref count reaches zero.
@@ -373,7 +381,7 @@ class CC_EXPORT GpuImageDecodeCache
 
   const SkColorType color_type_;
   viz::ContextProvider* context_;
-  sk_sp<GrContextThreadSafeProxy> context_threadsafe_proxy_;
+  int max_texture_size_ = 0;
 
   // All members below this point must only be accessed while holding |lock_|.
   // The exception are const members like |normal_max_cache_bytes_| that can