Added Abseil as a third-party dependency (Take 2)

Another attempt at https://dawn-review.googlesource.com/c/dawn/+/63780
Depends on https://skia-review.googlesource.com/c/skia/+/451638

This version of the CL fixes the Cmake and Skia compatibility issues
from the previous CL.

Bug: dawn:563
Change-Id: I41a7ee0aef1924df08a9be41e94effb7cd0025df
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/64600
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>

src/dawn_native/BUILD.gn

@@ -53,6 +53,17 @@ if (dawn_enable_vulkan) {
       dawn_enable_vulkan_loader && dawn_vulkan_loader_dir != ""
 }
 
+group("dawn_abseil") {
+  # When build_with_chromium=true we need to include "//third_party/abseil-cpp:absl" while
+  # it's beneficial to be more specific with standalone Dawn, especially when it comes to
+  # including it as a dependency in other projects (such as Skia).
+  if (build_with_chromium) {
+    public_deps = [ "$dawn_abseil_dir:absl" ]
+  } else {
+    public_deps = [ "${dawn_root}/third_party/gn/abseil-cpp:str_format" ]
+  }
+}
+
 config("dawn_native_internal") {
   configs = [ "${dawn_root}/src/common:dawn_internal" ]
 
@@ -142,6 +153,7 @@ source_set("dawn_native_headers") {
 # except those that define exported symbols.
 source_set("dawn_native_sources") {
   deps = [
+    ":dawn_abseil",
     ":dawn_native_headers",
     ":dawn_native_utils_gen",
     "${dawn_root}/src/common",

src/dawn_native/CMakeLists.txt

@@ -186,6 +186,8 @@ target_link_libraries(dawn_native
             dawn_internal_config
             libtint
             SPIRV-Tools-opt
+            absl_strings
+            absl_str_format_internal
 )
 
 if (DAWN_REQUIRES_SPIRV_CROSS)
@@ -195,6 +197,8 @@ if (DAWN_REQUIRES_SPIRV_CROSS)
     endif()
 endif()
 
+target_include_directories(dawn_native PRIVATE ${DAWN_ABSEIL_DIR})
+
 if (DAWN_USE_X11)
     find_package(X11 REQUIRED)
     target_link_libraries(dawn_native PRIVATE ${X11_LIBRARIES})

src/dawn_native/ShaderModule.cpp

@@ -14,6 +14,7 @@
 
 #include "dawn_native/ShaderModule.h"
 
+#include "absl/strings/str_format.h"
 #include "common/Constants.h"
 #include "common/HashUtils.h"
 #include "dawn_native/BindGroupLayout.h"
@@ -35,10 +36,8 @@ namespace dawn_native {
     namespace {
 
         std::string GetShaderDeclarationString(BindGroupIndex group, BindingNumber binding) {
-            std::ostringstream ostream;
-            ostream << "the shader module declaration at set " << static_cast<uint32_t>(group)
-                    << " binding " << static_cast<uint32_t>(binding);
-            return ostream.str();
+            return absl::StrFormat("the shader module declaration at set %u, binding %u",
+                                   static_cast<uint32_t>(group), static_cast<uint32_t>(binding));
         }
 
         tint::transform::VertexFormat ToTintVertexFormat(wgpu::VertexFormat format) {