Track GL buffer state based on unique resource ID

Reworks GrGLGpu to track GL buffer state based on the unique
GrGpuResource ID. This eliminates the need to notify the gpu object
whenever a buffer is deleted.

This change also allows us to remove the type specifier from GrBuffer.
At this point a buffer is just a chunk of memory, and the type
given at creation time is just a suggestion to the GL backend about
which target to bind to for updates.

BUG=skia:
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Committed: https://skia.googlesource.com/skia/+/deacc97bc63513b5eacaf21f858727f6e8b98ce5

Review URL: https://codereview.chromium.org/1854283004
diff --git a/tools/gpu/GrTest.cpp b/tools/gpu/GrTest.cpp
index 1fec1a6..95b7802 100644
--- a/tools/gpu/GrTest.cpp
+++ b/tools/gpu/GrTest.cpp
@@ -345,7 +345,7 @@
         return nullptr;
     }
 
-    GrBuffer* onCreateBuffer(GrBufferType, size_t, GrAccessPattern) override { return nullptr; }
+    GrBuffer* onCreateBuffer(size_t, GrBufferType, GrAccessPattern) override { return nullptr; }
 
     void onClear(GrRenderTarget*, const SkIRect& rect, GrColor color) override {}