Manual roll of Skia from 971c342c3030 to 280ac8882cff (#38257)

This roll changed a VulkanMemoryAllocator API

DEPS

diff --git a/DEPS b/DEPS
index c88de3e..2c9643e 100644
--- a/DEPS
+++ b/DEPS
@@ -18,7 +18,7 @@
   'llvm_git': 'https://llvm.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '971c342c30304ef6048384595b073b67d618b417',
+  'skia_revision': '280ac8882cffff56e83d5a3af6de903b5fcc87ac',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

ci/licenses_golden/licenses_skia

diff --git a/ci/licenses_golden/licenses_skia b/ci/licenses_golden/licenses_skia
index a3aa072..066f05c 100644
--- a/ci/licenses_golden/licenses_skia
+++ b/ci/licenses_golden/licenses_skia
@@ -1,4 +1,4 @@
-Signature: 734f452db823000268dff4a6e6d2e13e
+Signature: b1c69055420e97d4bd0f5d5d85ca9776
 
 UNUSED LICENSES:
 

flutter_vma/flutter_skia_vma.cc

diff --git a/flutter_vma/flutter_skia_vma.cc b/flutter_vma/flutter_skia_vma.cc
index 5b4eb89..fdcf228 100644
--- a/flutter_vma/flutter_skia_vma.cc
+++ b/flutter_vma/flutter_skia_vma.cc
@@ -259,16 +259,12 @@
   return vmaInvalidateAllocation(allocator_, allocation, offset, size);
 }
 
-uint64_t FlutterSkiaVulkanMemoryAllocator::totalUsedMemory() const {
+std::pair<uint64_t, uint64_t>
+FlutterSkiaVulkanMemoryAllocator::totalAllocatedAndUsedMemory() const {
   VmaTotalStatistics stats;
   vmaCalculateStatistics(allocator_, &stats);
-  return stats.total.statistics.allocationBytes;
-}
-
-uint64_t FlutterSkiaVulkanMemoryAllocator::totalAllocatedMemory() const {
-  VmaTotalStatistics stats;
-  vmaCalculateStatistics(allocator_, &stats);
-  return stats.total.statistics.blockBytes;
+  return {stats.total.statistics.blockBytes,
+          stats.total.statistics.allocationBytes};
 }
 
 }  // namespace flutter

flutter_vma/flutter_skia_vma.h

diff --git a/flutter_vma/flutter_skia_vma.h b/flutter_vma/flutter_skia_vma.h
index fd6a607..9faccf0 100644
--- a/flutter_vma/flutter_skia_vma.h
+++ b/flutter_vma/flutter_skia_vma.h
@@ -48,8 +48,7 @@
                             VkDeviceSize offset,
                             VkDeviceSize size) override;
 
-  uint64_t totalUsedMemory() const override;
-  uint64_t totalAllocatedMemory() const override;
+  std::pair<uint64_t, uint64_t> totalAllocatedAndUsedMemory() const override;
 
  private:
   FlutterSkiaVulkanMemoryAllocator(