Reland "Reland "SkSurface asynchronous read APIs allow client to extend pixel lifetime""

This is a reland of 6fc04f88a89ed2c9a1b4aa48bcd28602a69a457b

Original change's description:
> Reland "SkSurface asynchronous read APIs allow client to extend pixel lifetime"
> 
> This is a reland of ce240cc6fd8ec95bd051c7df2173dad2ae8f6ad6
> 
> Original change's description:
> > SkSurface asynchronous read APIs allow client to extend pixel lifetime
> > 
> > Previously the pixel data passed to the client was only valid during
> > the client's callback. This meant if the client wanted to defer
> > processing of the data a copy was necessary.
> > 
> > Now we pass an object to the callback and the pixel lifetime is tied
> > to the lifetime of that object.
> > 
> > The object may be holding a GPU transfer buffer mapped. We don't assume
> > that the object will be released on the direct GrContext thread. So
> > when the object is destroyed it posts a message to a new type,
> > GrClientMappedBufferManager, hanging off the direct context. The direct
> > context will periodically check for messages and unmap and then unref
> > buffers so that they can be reused. Currently this is done in
> > GrContext::performDeferredCleanup() and GrDrawingManager::flush().
> > 
> > The old API is kept around for backwards compatibility but it is
> > reimplemented as a bridge on top of the new mechanism.
> > 
> > Also a utility function to SkImageInfo is added to directly make a new
> > info with a specified dimensions rather than passing the width and
> > height separately to makeWH().
> > 
> > Bug: chromium:973403
> > Bug: skia:8962
> > 
> > Change-Id: Id5cf04235376170142a48e90d3ecd13fd021a2a6
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/245457
> > Reviewed-by: Brian Osman <brianosman@google.com>
> > Commit-Queue: Brian Salomon <bsalomon@google.com>
> 
> Bug: chromium:973403, skia:8962
> Change-Id: I5cecd36276c8b6dc942cf549c7095db2df88530c
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/245678
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

Bug: chromium:973403, skia:8962
Change-Id: Ie584c1c3ef8021c976f71b708e53871c693cc450
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/246057
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/core/SkPixmap.cpp b/src/core/SkPixmap.cpp
index 3da7c1f..c8a09ff 100644
--- a/src/core/SkPixmap.cpp
+++ b/src/core/SkPixmap.cpp
@@ -76,7 +76,7 @@
         const size_t bpp = fInfo.bytesPerPixel();
         pixels = (const uint8_t*)fPixels + r.fTop * fRowBytes + r.fLeft * bpp;
     }
-    result->reset(fInfo.makeWH(r.width(), r.height()), pixels, fRowBytes);
+    result->reset(fInfo.makeDimensions(r.size()), pixels, fRowBytes);
     return true;
 }
 
@@ -163,7 +163,7 @@
     }
 
     const void* srcPixels = this->addr(rec.fX, rec.fY);
-    const SkImageInfo srcInfo = fInfo.makeWH(rec.fInfo.width(), rec.fInfo.height());
+    const SkImageInfo srcInfo = fInfo.makeDimensions(rec.fInfo.dimensions());
     SkConvertPixels(rec.fInfo, rec.fPixels, rec.fRowBytes, srcInfo, srcPixels, this->rowBytes());
     return true;
 }