Adds new chained struct for device creation to specify cache options.

- Adds isolation key option, DawnNative support, and relevant unit tests.

Bug: dawn:549
Change-Id: I16344581c7956ce8576c0a4c14655fbdb4e15a54
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/81920
Reviewed-by: Shrek Shao <shrekshao@google.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Loko Kung <lokokung@google.com>

src/dawn/native/Device.cpp

@@ -184,6 +184,12 @@ namespace dawn::native {
         }
         ApplyFeatures(descriptor);
 
+        const DawnCacheDeviceDescriptor* cacheDesc = nullptr;
+        FindInChain(descriptor->nextInChain, &cacheDesc);
+        if (cacheDesc != nullptr) {
+            mCacheIsolationKey = cacheDesc->isolationKey;
+        }
+
         if (descriptor->requiredLimits != nullptr) {
             mLimits.v1 = ReifyDefaultLimits(descriptor->requiredLimits->limits);
         } else {
@@ -1738,6 +1744,10 @@ namespace dawn::native {
         return PipelineCompatibilityToken(mNextPipelineCompatibilityToken++);
     }
 
+    const std::string& DeviceBase::GetCacheIsolationKey() const {
+        return mCacheIsolationKey;
+    }
+
     const std::string& DeviceBase::GetLabel() const {
         return mLabel;
     }

src/dawn/native/Device.h

@@ -366,6 +366,7 @@ namespace dawn::native {
 
         PipelineCompatibilityToken GetNextPipelineCompatibilityToken();
 
+        const std::string& GetCacheIsolationKey() const;
         const std::string& GetLabel() const;
         void APISetLabel(const char* label);
         void APIDestroy();
@@ -540,6 +541,7 @@ namespace dawn::native {
         std::unique_ptr<CallbackTaskManager> mCallbackTaskManager;
         std::unique_ptr<dawn::platform::WorkerTaskPool> mWorkerTaskPool;
         std::string mLabel;
+        std::string mCacheIsolationKey = "";
     };
 
 }  // namespace dawn::native

src/dawn/tests/unittests/native/DeviceCreationTests.cpp

@@ -14,6 +14,8 @@
 
 #include "dawn/dawn_proc.h"
 #include "dawn/native/DawnNative.h"
+#include "dawn/native/Device.h"
+#include "dawn/native/dawn_platform.h"
 #include "dawn/tests/MockCallback.h"
 #include "dawn/utils/SystemUtils.h"
 #include "dawn/utils/WGPUHelpers.h"
@@ -24,7 +26,7 @@ namespace {
 
     using namespace testing;
 
-    class DeviceCreationTest : public testing::Test {
+    class DeviceCreationTest : public Test {
       protected:
         void SetUp() override {
             dawnProcSetProcs(&dawn::native::GetProcs());
@@ -83,6 +85,45 @@ namespace {
         EXPECT_THAT(toggles, testing::Contains(testing::StrEq(toggle)));
     }
 
+    TEST_F(DeviceCreationTest, CreateDeviceWithCacheSuccess) {
+        // Default device descriptor should have an empty cache isolation key.
+        {
+            wgpu::DeviceDescriptor desc = {};
+            wgpu::Device device = adapter.CreateDevice(&desc);
+            EXPECT_NE(device, nullptr);
+
+            EXPECT_THAT(dawn::native::FromAPI(device.Get())->GetCacheIsolationKey(),
+                        testing::StrEq(""));
+        }
+        // Device descriptor with empty cache descriptor should have an empty cache isolation key.
+        {
+            wgpu::DeviceDescriptor desc = {};
+            wgpu::DawnCacheDeviceDescriptor cacheDesc = {};
+            desc.nextInChain = &cacheDesc;
+
+            wgpu::Device device = adapter.CreateDevice(&desc);
+            EXPECT_NE(device, nullptr);
+
+            EXPECT_THAT(dawn::native::FromAPI(device.Get())->GetCacheIsolationKey(),
+                        testing::StrEq(""));
+        }
+        // Specified cache isolation key should be retained.
+        {
+            wgpu::DeviceDescriptor desc = {};
+            wgpu::DawnCacheDeviceDescriptor cacheDesc = {};
+            desc.nextInChain = &cacheDesc;
+
+            const char* isolationKey = "isolation key";
+            cacheDesc.isolationKey = isolationKey;
+
+            wgpu::Device device = adapter.CreateDevice(&desc);
+            EXPECT_NE(device, nullptr);
+
+            EXPECT_THAT(dawn::native::FromAPI(device.Get())->GetCacheIsolationKey(),
+                        testing::StrEq(isolationKey));
+        }
+    }
+
     // Test successful call to RequestDevice with descriptor
     TEST_F(DeviceCreationTest, RequestDeviceSuccess) {
         WGPUDevice cDevice;