Generic template and forward in stringstream.

This CL updates the templates in the StringStream to match more types.
All of the internal `operator<<` methods have been converted over to
StringStream. The precision was increased in order to better match the
precision needed to read back as a double.

Bug: tint:1686
Change-Id: Iaa15cf247f174967dd1014647ba5a74804997c22
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/122080
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>

test/tint/extensions/parsing/basic.wgsl.expected.dxc.hlsl

@@ -3,7 +3,7 @@ struct tint_symbol {
 };
 
 float4 main_inner() {
-  return float4(0.100000001f, 0.200000003f, 0.300000012f, 0.400000006f);
+  return float4(0.10000000149011611938f, 0.20000000298023223877f, 0.30000001192092895508f, 0.40000000596046447754f);
 }
 
 tint_symbol main() {

test/tint/extensions/parsing/basic.wgsl.expected.fxc.hlsl

@@ -3,7 +3,7 @@ struct tint_symbol {
 };
 
 float4 main_inner() {
-  return float4(0.100000001f, 0.200000003f, 0.300000012f, 0.400000006f);
+  return float4(0.10000000149011611938f, 0.20000000298023223877f, 0.30000001192092895508f, 0.40000000596046447754f);
 }
 
 tint_symbol main() {

test/tint/extensions/parsing/basic.wgsl.expected.glsl

@@ -4,7 +4,7 @@ precision mediump float;
 
 layout(location = 0) out vec4 value;
 vec4 tint_symbol() {
-  return vec4(0.100000001f, 0.200000003f, 0.300000012f, 0.400000006f);
+  return vec4(0.10000000149011611938f, 0.20000000298023223877f, 0.30000001192092895508f, 0.40000000596046447754f);
 }
 
 void main() {

test/tint/extensions/parsing/basic.wgsl.expected.msl

@@ -6,7 +6,7 @@ struct tint_symbol_1 {
 };
 
 float4 tint_symbol_inner() {
-  return float4(0.100000001f, 0.200000003f, 0.300000012f, 0.400000006f);
+  return float4(0.10000000149011611938f, 0.20000000298023223877f, 0.30000001192092895508f, 0.40000000596046447754f);
 }
 
 fragment tint_symbol_1 tint_symbol() {

test/tint/extensions/parsing/basic.wgsl.expected.wgsl

@@ -2,5 +2,5 @@ enable f16;
 
 @fragment
 fn main() -> @location(0) vec4<f32> {
-  return vec4<f32>(0.1, 0.2, 0.3, 0.4);
+  return vec4<f32>(0.10000000000000000555, 0.2000000000000000111, 0.2999999999999999889, 0.4000000000000000222);
 }

test/tint/extensions/parsing/duplicated_extensions.wgsl.expected.dxc.hlsl

@@ -3,7 +3,7 @@ struct tint_symbol {
 };
 
 float4 main_inner() {
-  return float4(0.100000001f, 0.200000003f, 0.300000012f, 0.400000006f);
+  return float4(0.10000000149011611938f, 0.20000000298023223877f, 0.30000001192092895508f, 0.40000000596046447754f);
 }
 
 tint_symbol main() {

test/tint/extensions/parsing/duplicated_extensions.wgsl.expected.fxc.hlsl

@@ -3,7 +3,7 @@ struct tint_symbol {
 };
 
 float4 main_inner() {
-  return float4(0.100000001f, 0.200000003f, 0.300000012f, 0.400000006f);
+  return float4(0.10000000149011611938f, 0.20000000298023223877f, 0.30000001192092895508f, 0.40000000596046447754f);
 }
 
 tint_symbol main() {

test/tint/extensions/parsing/duplicated_extensions.wgsl.expected.glsl

@@ -4,7 +4,7 @@ precision mediump float;
 
 layout(location = 0) out vec4 value;
 vec4 tint_symbol() {
-  return vec4(0.100000001f, 0.200000003f, 0.300000012f, 0.400000006f);
+  return vec4(0.10000000149011611938f, 0.20000000298023223877f, 0.30000001192092895508f, 0.40000000596046447754f);
 }
 
 void main() {

test/tint/extensions/parsing/duplicated_extensions.wgsl.expected.msl

@@ -6,7 +6,7 @@ struct tint_symbol_1 {
 };
 
 float4 tint_symbol_inner() {
-  return float4(0.100000001f, 0.200000003f, 0.300000012f, 0.400000006f);
+  return float4(0.10000000149011611938f, 0.20000000298023223877f, 0.30000001192092895508f, 0.40000000596046447754f);
 }
 
 fragment tint_symbol_1 tint_symbol() {

test/tint/extensions/parsing/duplicated_extensions.wgsl.expected.wgsl

@@ -4,5 +4,5 @@ enable f16;
 
 @fragment
 fn main() -> @location(0) vec4<f32> {
-  return vec4<f32>(0.1, 0.2, 0.3, 0.4);
+  return vec4<f32>(0.10000000000000000555, 0.2000000000000000111, 0.2999999999999999889, 0.4000000000000000222);
 }