[web] Fix 2 bugs in emdawnwebgpu (patches dawn)

cmake/external/onnxruntime_external_deps.cmake

@@ -752,6 +752,16 @@ if (onnxruntime_USE_WEBGPU)
           #
           ${Patch_EXECUTABLE} --binary --ignore-whitespace -p1 < ${PROJECT_SOURCE_DIR}/patches/dawn/safari_polyfill.patch &&
 
+          # The dawn_device_lost_keepalive.patch contains the following changes:
+          #
+          # - (private) Fix premature ABORT when device.lost fires in callUserCallback
+          #   The device.lost handler was wrapped in callUserCallback without runtimeKeepalivePush/Pop,
+          #   causing maybeExit() to trigger _exit(0) and set ABORT=true when runtimeKeepaliveCounter
+          #   was 0. This silently dropped all subsequent WebGPU callbacks (e.g. requestAdapter),
+          #   breaking session re-creation after device destruction.
+          #
+          ${Patch_EXECUTABLE} --binary --ignore-whitespace -p1 < ${PROJECT_SOURCE_DIR}/patches/dawn/dawn_device_lost_keepalive.patch &&
+
           # The dawn_dxc_output_dir.patch contains the following changes:
           #
           # - (private) Fix DXC output directory for RelWithDebInfo and MinSizeRel configs
@@ -762,6 +772,17 @@ if (onnxruntime_USE_WEBGPU)
           #
           ${Patch_EXECUTABLE} --binary --ignore-whitespace -p1 < ${PROJECT_SOURCE_DIR}/patches/dawn/dawn_dxc_output_dir.patch &&
 
+          # The dawn_buffer_fix_injection.patch contains the following changes:
+          #
+          # - (private) Fix importJsBuffer calling wrong WGPUBufferImpl constructor
+          #   Without this patch, importJsBuffer calls emwgpuCreateBuffer which invokes the
+          #   (source, mappedAtCreation=false) constructor instead of the injection constructor
+          #   tagged with kImportedFromJS. This removes the unused WGPUBufferMapState parameter
+          #   from the injection constructor so emwgpuCreateBuffer correctly uses it, ensuring
+          #   imported buffers are properly tagged as kImportedFromJS.
+          #
+          ${Patch_EXECUTABLE} --binary --ignore-whitespace -p1 < ${PROJECT_SOURCE_DIR}/patches/dawn/dawn_buffer_fix_injection.patch &&
+
           # Remove the test folder to speed up potential file scan operations (70k+ files not needed for build).
           # Using <SOURCE_DIR> token ensures the correct absolute path regardless of working directory.
           ${CMAKE_COMMAND} -E rm -rf <SOURCE_DIR>/test)

cmake/patches/dawn/dawn_buffer_fix_injection.patch

@@ -0,0 +1,35 @@
+diff --git a/third_party/emdawnwebgpu/pkg/webgpu/src/webgpu.cpp b/third_party/emdawnwebgpu/pkg/webgpu/src/webgpu.cpp
+--- a/third_party/emdawnwebgpu/pkg/webgpu/src/webgpu.cpp
++++ b/third_party/emdawnwebgpu/pkg/webgpu/src/webgpu.cpp
+@@ -749,7 +749,7 @@ struct WGPUBufferImpl final : public EventSource,
+  public:
+   WGPUBufferImpl(const EventSource* source, bool mappedAtCreation);
+   // Injection constructor used when we already have a backing Buffer.
+-  WGPUBufferImpl(const EventSource* source, WGPUBufferMapState mapState);
++  WGPUBufferImpl(const EventSource* source);
+   ~WGPUBufferImpl();
+
+   void Destroy();
+@@ -1301,7 +1301,7 @@ WGPUAdapter emwgpuCreateAdapter(const EventSource* source) {
+ }
+
+ WGPUBuffer emwgpuCreateBuffer(const EventSource* source) {
+-  return ReturnToAPI(AcquireRef(new WGPUBufferImpl(source, false)));
++  return ReturnToAPI(AcquireRef(new WGPUBufferImpl(source)));
+ }
+
+ WGPUDevice emwgpuCreateDevice(const EventSource* source, WGPUQueue queue) {
+@@ -1441,11 +1441,10 @@ WGPUBufferImpl::WGPUBufferImpl(const EventSource* source, bool mappedAtCreation)
+   }
+ }
+
+-WGPUBufferImpl::WGPUBufferImpl(const EventSource* source,
+-                               WGPUBufferMapState mapState)
++WGPUBufferImpl::WGPUBufferImpl(const EventSource* source)
+     : EventSource(source),
+       RefCountedWithExternalCount(kImportedFromJS),
+-      mMapState(mapState) {}
++      mMapState(WGPUBufferMapState_Unmapped) {}
+
+ WGPUBufferImpl::~WGPUBufferImpl() {
+   if (!IsImported()) {

cmake/patches/dawn/dawn_device_lost_keepalive.patch

@@ -0,0 +1,22 @@
+diff --git a/third_party/emdawnwebgpu/pkg/webgpu/src/library_webgpu.js b/third_party/emdawnwebgpu/pkg/webgpu/src/library_webgpu.js
+--- a/third_party/emdawnwebgpu/pkg/webgpu/src/library_webgpu.js
++++ b/third_party/emdawnwebgpu/pkg/webgpu/src/library_webgpu.js
+@@ -876,7 +876,9 @@
+ #if ASSERTIONS
+         assert(deviceLostFutureId);
+ #endif
+-        // Don't keepalive here, because this isn't guaranteed to ever happen.
++        // Keep the runtime alive until device.lost resolves, to prevent
++        // maybeExit() from triggering premature ABORT during callUserCallback.
++        {{{ runtimeKeepalivePush() }}}
+         WebGPU.Internals.futureInsert(deviceLostFutureId, device.lost.then((info) => {
+           // If the runtime has exited, avoid calling callUserCallback as it
+           // will print an error (e.g. if the device got freed during shutdown).
+@@ -892,6 +894,7 @@
+               {{{ gpu.passAsPointer('messagePtr') }}});
+             stackRestore(sp);
+           });
++          {{{ runtimeKeepalivePop() }}}
+         }));
+
+         // Set up uncaptured error handlers.