media: replace LUMINANCE_F16 by RG_88 for 9/10-bit h264 videos

cc/resources/resource_provider.cc

Index: cc/resources/resource_provider.cc
diff --git a/cc/resources/resource_provider.cc b/cc/resources/resource_provider.cc
index 49dae1d6ae988284713422c430f0f1e8a2f814e8..c48f96db5b9a54d8a94a6b2b13cfbd53cfdf3cf1 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -12,6 +12,7 @@
 #include <unordered_map>
 
 #include "base/atomic_sequence_num.h"
+#include "base/command_line.h"
 #include "base/macros.h"
 #include "base/metrics/histogram.h"
 #include "base/numerics/safe_math.h"
@@ -22,6 +23,7 @@
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/trace_event.h"
+#include "cc/base/switches.h"
 #include "cc/resources/platform_color.h"
 #include "cc/resources/resource_util.h"
 #include "cc/resources/returned_resource.h"
@@ -92,6 +94,7 @@ GLenum TextureToStorageFormat(ResourceFormat format) {
     case RGB_565:
     case ETC1:
     case RED_8:
+    case RG_88:
     case LUMINANCE_F16:
       NOTREACHED();
       break;
@@ -112,6 +115,7 @@ bool IsFormatSupportedForStorage(ResourceFormat format, bool use_bgra) {
     case RGB_565:
     case ETC1:
     case RED_8:
+    case RG_88:
     case LUMINANCE_F16:
       return false;
   }
@@ -456,6 +460,13 @@ ResourceProvider::ResourceProvider(
     yuv_resource_format_ = caps.texture_rg ? RED_8 : LUMINANCE_8;
     yuv_highbit_resource_format_ =
         caps.texture_half_float_linear ? LUMINANCE_F16 : yuv_resource_format_;
+    const base::CommandLine* command_line =
+        base::CommandLine::ForCurrentProcess();
+    if (command_line->HasSwitch(switches::kDisableHalfFloatConversionTexture) ||
+        !caps.texture_half_float_linear) {
+      yuv_highbit_resource_format_ =
+          caps.texture_rg ? RG_88 : yuv_highbit_resource_format_;
+    }
   }
 
   use_sync_query_ = caps.sync_query;
@@ -523,6 +534,7 @@ bool ResourceProvider::IsResourceFormatSupported(ResourceFormat format) const {
     case ETC1:
       return caps.texture_format_etc1;
     case RED_8:
+    case RG_88:
       return caps.texture_rg;
     case LUMINANCE_F16:
       return caps.texture_half_float_linear;
@@ -664,6 +676,7 @@ ResourceId ResourceProvider::CreateResourceFromTextureMailbox(
   DCHECK(mailbox.IsValid());
   Resource* resource = nullptr;
   if (mailbox.IsTexture()) {
+    // TODO(dshwang): the resource can be R_8 or RG_88. crbug.com/624436
     resource = InsertResource(
         id,
         Resource(0, mailbox.size_in_pixels(), Resource::EXTERNAL,